<SEC-DOCUMENT>0001062822-11-000072.txt : 20111122
<SEC-HEADER>0001062822-11-000072.hdr.sgml : 20111122
<ACCEPTANCE-DATETIME>20111122083840
ACCESSION NUMBER:		0001062822-11-000072
CONFORMED SUBMISSION TYPE:	424B5
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20111122
DATE AS OF CHANGE:		20111122

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LEXICON PHARMACEUTICALS, INC./DE
		CENTRAL INDEX KEY:			0001062822
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				760474169
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		424B5
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-171953
		FILM NUMBER:		111220445

	BUSINESS ADDRESS:	
		STREET 1:		8800 TECHNOLOGY FOREST PLACE
		CITY:			THE WOODLANDS
		STATE:			TX
		ZIP:			77381
		BUSINESS PHONE:		2818633000

	MAIL ADDRESS:	
		STREET 1:		8800 TECHNOLOGY FOREST PLACE
		CITY:			THE WOODLANDS
		STATE:			TX
		ZIP:			77381

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	LEXICON GENETICS INC/TX
		DATE OF NAME CHANGE:	20000126
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B5
<SEQUENCE>1
<FILENAME>prospectusrighsofferingnov.htm
<DESCRIPTION>PROSPECTUS
<TEXT>
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		<title>Prospectus (Righs Offering Nov 2011)</title>
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<a name="s5B220FDCA8822116BDF664A91C35EA41"></a><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;padding-top:6px;text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Filed Pursuant to Rule 424(b)(5)</font></div><div style="line-height:120%;text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Registration No. 333-171953</font></div><div style="line-height:120%;padding-top:6px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">PROSPECTUS SUPPLEMENT</font></div><div style="line-height:120%;padding-bottom:6px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(To Prospectus Dated November 7, 2011) </font></div><div style="line-height:120%;text-align:center;"><img src="logoa02.jpg" style="color:#ff0000;font-weight:bold;height:118px;width:265px;"></div><div style="line-height:120%;text-align:center;font-size:18pt;"><font style="font-family:inherit;font-size:18pt;font-weight:bold;">Lexicon Pharmaceuticals, Inc.</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">144,247,542 Shares Common Stock</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">__________________</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are distributing, at no charge, to holders of our common stock non-transferable subscription rights to purchase up to 144,247,542 shares of our common stock.  We refer to this offering as the &#8220;rights offering.&#8221;  In the rights offering, you will receive one subscription right for every share of common stock you owned at 5:00&#160;p.m., New York time, on November&#160;21, 2011, the record date.</font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each whole subscription right will entitle you to purchase 0.427175 shares of our common stock at a subscription price of $1.13 per share, which we refer to as the &#8220;basic subscription privilege.&#8221;  We will not issue fractional shares of common stock in the rights offering, and holders will only be entitled to purchase a whole number of shares of common stock, rounded down to the nearest whole number a holder would otherwise be entitled to purchase.  If you exercise your rights in full, you may also exercise an over-subscription right to purchase additional shares that remain unsubscribed for at the expiration of the rights offering, subject to availability and certain other limitations, which we refer to as the &#8220;over-subscription privilege.&#8221;</font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are conducting the rights offering at the election of two of our largest stockholders, Invus, L.P. and Invus C.V., which we refer to collectively as &#8220;Invus,&#8221; pursuant to their contractual rights to require us to initiate a pro rata rights offering to our stockholders.  Invus is required to exercise its basic subscription privilege in full and purchase at least 68,868,892 shares of our common stock in the rights offering, subject to customary closing conditions.</font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription rights may not be transferred or sold.  The subscription rights will expire and will be void and worthless if they are not exercised by 5:00&#160;p.m., New York time, on December 22, 2011, unless we and Invus agree to extend the rights offering period.  We reserve the right to cancel the rights offering at any time, for any reason, with Invus' consent.</font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You should carefully consider whether to exercise your subscription rights before the expiration of the rights offering.  All exercises of subscription rights are irrevocable.  If you do not exercise your basic subscription privilege in full, you will own, upon completion of the rights offering, a smaller proportional interest in our common stock than otherwise would be the case if you had fully exercised your rights.</font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have engaged BNY Mellon Shareowner Services to serve as the subscription agent for the rights offering.  The subscription agent will hold in escrow the funds we receive from subscribers until we complete or cancel the rights offering.  This is not an underwritten offering. The shares are being offered directly by us without the services of an underwriter or selling agent. BNY Mellon Shareowner Services also will serve as information agent for the rights offering.</font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our common stock is listed on the Nasdaq Global Select Market under the symbol &#8220;LXRX.&#8221;  On November&#160;21, 2011, the last reported sale price of our common stock on the Nasdaq Global Select Market was $1.02 per share.</font></div><div style="line-height:100%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Exercising your subscription rights and investing in our common stock involves risks.  See &#8220;Risk Factors&#8221; beginning on page S-13 of this prospectus supplement.</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:83.984375%;border-collapse:collapse;text-align:left;"><tr><td colspan="10"></td></tr><tr><td width="17%"></td><td width="45%"></td><td width="3%"></td><td width="1%"></td><td width="9%"></td><td width="1%"></td><td width="3%"></td><td width="1%"></td><td width="19%"></td><td width="1%"></td></tr><tr><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Per Share</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Aggregate</font></div></td></tr><tr><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Subscription Price</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.1300</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">162,999,722</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Estimated Expenses</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">0.0042</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">600,000</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Net Proceeds to Us</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.1258</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">162,399,722</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:5px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:5px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:5px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:5px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:5px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:5px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:100%;padding-bottom:8px;padding-top:5px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved these securities or passed upon the accuracy or adequacy of this prospectus supplement or the accompanying prospectus.  Any representation to the contrary is a criminal offense. </font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"> November 22, 2011</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><hr style="page-break-after:always"><a name="s432F8705E6CF381B375464A91C499A4B"></a><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">TABLE OF CONTENTS</font></div><div style="line-height:120%;padding-bottom:4px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Prospectus Supplement</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:88.28125%;border-collapse:collapse;text-align:left;"><tr><td colspan="4"></td></tr><tr><td width="40%"></td><td width="7%"></td><td width="46%"></td><td width="7%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;text-decoration:underline;">Page</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;text-decoration:underline;">Page</font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7054C32F4F98AF4FBFDC64A91C53AAB1"><font style="font-family:inherit;font-size:10pt;">Prospectus Supplement Summary</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7054C32F4F98AF4FBFDC64A91C53AAB1">S-3</a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-left:12px;text-indent:-12px;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFB7D87979A94633FD1A364A91D610042"><font style="font-family:inherit;font-size:10pt;">Material United States Federal Income Tax Consequences</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sFB7D87979A94633FD1A364A91D610042">S-28</a></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-left:12px;text-indent:-12px;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s1736338B1DDB0DFB617164A91C7B002A"><font style="font-family:inherit;font-size:10pt;">Questions and Answers Relating to the Rights Offering</font></a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s1736338B1DDB0DFB617164A91C7B002A">S-8</a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s49E31C5699408CD85A7F64A91D76EA0D"><font style="font-family:inherit;font-size:10pt;">Capitalization</font></a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s49E31C5699408CD85A7F64A91D76EA0D">S-31</a></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD308360F388906C8AB5664A91CDFF1A7"><font style="font-family:inherit;font-size:10pt;">Risk Factors</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD308360F388906C8AB5664A91CDFF1A7">S-13</a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBD975E95EE6D720ECBD664A91D8018E0"><font style="font-family:inherit;font-size:10pt;">Plan of Distribution</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBD975E95EE6D720ECBD664A91D8018E0">S-32</a></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-left:12px;text-indent:-12px;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7F6452D383337A2B5F9B64A91D119368"><font style="font-family:inherit;font-size:10pt;">Special Note Regarding Forward-Looking Statements</font></a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7F6452D383337A2B5F9B64A91D119368">S-17</a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s9515A6F0E21E4D58D50F64A91D9428CB"><font style="font-family:inherit;font-size:10pt;">Use of Proceeds</font></a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s9515A6F0E21E4D58D50F64A91D9428CB">S-33</a></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-left:12px;text-indent:-12px;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sA9AA2F55F398EE69EC3764A91D1B5768"><font style="font-family:inherit;font-size:10pt;">Market Price of Our Common Stock and Related Stockholder Matters</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sA9AA2F55F398EE69EC3764A91D1B5768">S-18</a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sC25EFCC5F387622636EB64A91DA8B27A"><font style="font-family:inherit;font-size:10pt;">Legal Matters</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sC25EFCC5F387622636EB64A91DA8B27A">S-33</a></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBB4179587472005C8CC6AE4C98B20CF1"><font style="font-family:inherit;font-size:10pt;">Arrangements with Invus</font></a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBB4179587472005C8CC6AE4C98B20CF1">S-19</a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sF8DAB274C5D05740CDC664A91DB2E002"><font style="font-family:inherit;font-size:10pt;">Experts</font></a></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sF8DAB274C5D05740CDC664A91DB2E002">S-33</a></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD8223FF55816DBAAC17B64A91D4DCFA7"><font style="font-family:inherit;font-size:10pt;">The Rights Offering</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD8223FF55816DBAAC17B64A91D4DCFA7">S-22</a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s8C84CB1874F82DBE195264A91DC66516"><font style="font-family:inherit;font-size:10pt;">Where You Can Find More Information</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s8C84CB1874F82DBE195264A91DC66516">S-33</a></div></td></tr></table></div></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Prospectus</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:87.3046875%;border-collapse:collapse;text-align:left;"><tr><td colspan="4"></td></tr><tr><td width="39%"></td><td width="7%"></td><td width="47%"></td><td width="7%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;text-decoration:underline;">Page</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;text-decoration:underline;">Page</font></div></td></tr><tr><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s0FA236FCB80A3128EFEAB7D4F5B0C573"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc.</font></a></div></td><td style="vertical-align:top;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s0FA236FCB80A3128EFEAB7D4F5B0C573">3</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:12px;text-indent:-12px;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s8FB9081BAAAAAF3CA839B7D5E9687E1A"><font style="font-family:inherit;font-size:10pt;">Special Note Regarding Forward-Looking Statements</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s8FB9081BAAAAAF3CA839B7D5E9687E1A">15</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s34C4260DC9A5842B23C0B7D51A0E5E71"><font style="font-family:inherit;font-size:10pt;">Risk Factors</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s34C4260DC9A5842B23C0B7D51A0E5E71">4</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD07F871ABA8A863A1A3EB7D61ED921C2"><font style="font-family:inherit;font-size:10pt;">Ratio of Earnings to Fixed Charges</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD07F871ABA8A863A1A3EB7D61ED921C2">16</a></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s564DB571A055419668C6B7D5373C4D04"><font style="font-family:inherit;font-size:10pt;">Description of Capital Stock</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s564DB571A055419668C6B7D5373C4D04">4</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7676C22867E2B7BBD5AEB7D69D4C43EB"><font style="font-family:inherit;font-size:10pt;">Use of Proceeds</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7676C22867E2B7BBD5AEB7D69D4C43EB">16</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s9131D7EED20C8E27DC43B7DDDAAA581A"><font style="font-family:inherit;font-size:10pt;">Description of Debt Securities</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s9131D7EED20C8E27DC43B7DDDAAA581A">8</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sF583A813A84FB8E81D11B7D6B638EBF0"><font style="font-family:inherit;font-size:10pt;">Plan of Distribution</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sF583A813A84FB8E81D11B7D6B638EBF0">16</a></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s38EB0A25CFCAE1FE6D04B7D55A517FD6"><font style="font-family:inherit;font-size:10pt;">Description of Warrants</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s38EB0A25CFCAE1FE6D04B7D55A517FD6">10</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s328ACEEF4486D8292135B7D7066E0BFA"><font style="font-family:inherit;font-size:10pt;">Legal Matters</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s328ACEEF4486D8292135B7D7066E0BFA">18</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBF7ED4D7E15A3DD74775B7D57FF9263A"><font style="font-family:inherit;font-size:10pt;">Description of Rights</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBF7ED4D7E15A3DD74775B7D57FF9263A">11</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s959B130BC5B299FF1ED3B7D7339B231C"><font style="font-family:inherit;font-size:10pt;">Experts</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s959B130BC5B299FF1ED3B7D7339B231C">18</a></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s3B8C9E2F3411BD4A09E3B7D5A7BC4457"><font style="font-family:inherit;font-size:10pt;">Description of Units</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s3B8C9E2F3411BD4A09E3B7D5A7BC4457">12</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s45AFCE0AF55FE061E866B7D767884215"><font style="font-family:inherit;font-size:10pt;">Where You Can Find More Information</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s45AFCE0AF55FE061E866B7D767884215">18</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s05E391489B300328DA53B7D5C568D4FD"><font style="font-family:inherit;font-size:10pt;">Legal Ownership of Securities</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s05E391489B300328DA53B7D5C568D4FD">13</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s4F4E773A4CB69D8C2349B7D7929F64DA"><font style="font-family:inherit;font-size:10pt;">Documents Incorporated by Reference</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s4F4E773A4CB69D8C2349B7D7929F64DA">18</a></div></td></tr></table></div></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">____________</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">You should rely only on the information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus.  We have not authorized anyone to provide you with information different from that contained or incorporated by reference in this prospectus supplement and the accompanying prospectus.  This prospectus supplement and the accompanying prospectus may only be used where it is legal to sell these securities.  The information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus are accurate only as of the date of this prospectus supplement, or the documents incorporated by reference, regardless of the time of delivery of this prospectus supplement and accompanying prospectus or of any sale of these securities.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">____________</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In this prospectus supplement and the accompanying prospectus, &#8220;Lexicon,&#8221; &#8220;Lexicon Pharmaceuticals,&#8221; &#8220;we,&#8221; &#8220;us&#8221; and &#8220;our&#8221; refer to Lexicon Pharmaceuticals, Inc. and its subsidiaries.  We own or have rights to trademarks or trade names that we use in connection with the operation of our business.  The Lexicon name and logo, LexVision</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">&#174;</sup></font><font style="font-family:inherit;font-size:10pt;"> and OmniBank</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">&#174;</sup></font><font style="font-family:inherit;font-size:10pt;"> are registered trademarks and Genome5000</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">&#8482;</sup></font><font style="font-family:inherit;font-size:10pt;"> is a trademark of Lexicon Pharmaceuticals, Inc.</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><hr style="page-break-after:always"><a name="s7054C32F4F98AF4FBFDC64A91C53AAB1"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:100%;border-collapse:collapse;text-align:left;"><tr><td colspan="5"></td></tr><tr><td width="2%"></td><td width="4%"></td><td width="4%"></td><td width="85%"></td><td width="5%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" 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style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have completed a Phase 2a clinical trial and have initiated a dose-ranging study to explore higher doses of LX2931, an orally-delivered small molecule compound that we are developing as a treatment for rheumatoid arthritis and other autoimmune diseases.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="vertical-align:top;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;vertical-align:top;">We have also advanced small molecule compounds from a number of additional drug programs into various stages of preclinical development and research and believe that our systematic, target biology-driven approach to drug discovery will enable us to continue to expand our clinical pipeline.</font></div><div style="padding-bottom:10px;vertical-align:top;text-indent:24px;font-size:10pt;"><font 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style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are working both independently and through strategic collaborations and alliances to capitalize on our technology, drug target discoveries and drug discovery and development programs.  Consistent with this approach, we seek to retain exclusive rights to the benefits of certain of our small molecule drug programs by developing drug candidates from those programs internally and to collaborate with third parties with respect to the discovery, development and commercialization of small molecule and biotherapeutic drug candidates for other targets, particularly when the collaboration provides us with access to expertise and resources that we do not possess internally or are complementary to our own.  We have established drug discovery and development collaborations with a number of leading pharmaceutical and biotechnology companies which generated near-term cash while offering us the potential to retain economic participation in products our collaborators develop through the collaboration.  In addition, we have established collaborations and license agreements with other leading pharmaceutical and biotechnology companies, research institutes and academic institutions under which we received fees and, in some cases, are eligible to receive milestone and royalty payments, in return for granting access to some of our technologies and discoveries.</font></div><div style="text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">_________________</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc. was incorporated in Delaware in July 1995, and commenced operations in September 1995.  Our corporate headquarters are located at 8800 Technology Forest Place, The Woodlands, Texas 77381, and our telephone number is (281) 863-3000.  Our common stock is listed on the Nasdaq Global Select Market under the symbol &#8220;LXRX.&#8221;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:12px;text-align:center;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-3</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;text-align:center;padding-left:48px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:683px;border-collapse:collapse;text-align:left;"><tr><td colspan="5"></td></tr><tr><td width="22px"></td><td width="24px"></td><td width="24px"></td><td width="578px"></td><td width="33px"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-bottom:13px;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, or Exchange Act, are made available free of charge on our corporate website located at www.lexpharma.com as soon as reasonably practicable after the filing of those reports with the Securities and Exchange Commission, or SEC.  Information found on our website is not incorporated by reference into this prospectus supplement and the accompanying prospectus and should not be considered part of this document.</font></div><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font 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style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font 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style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid 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style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Securities offered</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are distributing to you, at no charge, one non-transferable subscription right for every share of our common stock that you own as of 5:00 p.m., New York time, on the record date, either as a holder of record or, in the case of shares held of record by brokers, dealers, custodian banks or other nominees on your behalf, as a beneficial owner of such shares.</font></div><div style="font-size:10pt;"><font 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style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" 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style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Basic subscription privilege</font></div></td><td 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style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Record date</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">5:00 p.m., New York time, on November 21, 2011.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Expiration date</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="vertical-align:top;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;vertical-align:top;">5:00 p.m., New York time, on December 22, 2011, unless we and Invus agree to extend the rights offering period.  </font></div><div style="vertical-align:top;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Transferability of rights</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription rights are non-transferable during the course of the subscription period.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No recommendation</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our board of directors makes no recommendation about whether you should exercise any of your subscription rights.  You are urged to make an independent investment decision about whether to exercise your subscription rights based on your own assessment of our business and the rights offering.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No revocation</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Any exercise of subscription rights is irrevocable, even if Invus does not exercise its basic subscription privilege in full because certain customary closing conditions are not satisfied or you later learn information that you consider to be unfavorable to the exercise of your subscription rights. See the section entitled &#8220;Arrangements with Invus.&#8221; You should not exercise your subscription rights unless you are certain that you wish to purchase additional shares of common stock at the subscription price of $1.13 per share.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:16px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:10px;text-align:justify;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-5</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:center;padding-left:48px;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:672px;border-collapse:collapse;text-align:left;"><tr><td colspan="7"></td></tr><tr><td width="21px"></td><td width="24px"></td><td width="22px"></td><td width="209px"></td><td width="5px"></td><td width="373px"></td><td width="17px"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td 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style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:8px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Material United Stated federal income tax</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font 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style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-top:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For United States federal income tax purposes, you will not recognize income or loss upon receipt or exercise of subscription rights.  You should consult your own tax advisor as to your particular tax consequences resulting from the rights offering.  For a detailed discussion, see the section entitled &#8220;Material United States Federal Income Tax Consequences.&#8221; </font></div><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Purchase commitment</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Invus is required to exercise its basic subscription privilege in full and purchase at least 68,868,892 shares of our common stock in the rights offering, subject to certain customary closing conditions.  See the section entitled &#8220;Arrangements with Invus.&#8221;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Extension, cancellation, and amendment</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">With Invus' consent, we have the option to extend the rights offering and the period for exercising your subscription rights, although we do not presently intend to do so.  With Invus' consent, we may also cancel the rights offering at any time for any reason.  If the rights offering is cancelled, all subscription payments received by the subscription agent will be returned promptly, without interest or penalty.  With Invus' consent, we also reserve the right to amend or modify the terms of the rights offering.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td 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You may make delivery by mail or commercial carrier.  If regular mail is used for this purpose, we recommend using registered mail, properly insured, with return receipt requested.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:9px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a beneficial owner of shares that are registered in the name of a broker, dealer, custodian bank or other nominee, we will instruct your broker, dealer, custodian bank or other nominee to provide you with materials relating to the rights offering.  You may exercise your subscription rights by following the instructions contained in the rights offering materials in order to direct your broker, dealer, custodian bank or other nominee to exercise your subscription rights on your behalf and deliver all documents and payments to the subscription agent before 5:00 p.m., New York time, on December 22, 2011.  You should promptly contact your broker, dealer, custodian bank or other nominee if you believe you are entitled to participate in the rights offering, but have not received any rights offering materials.</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font 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#000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Use of proceeds</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Assuming the full subscription, the net proceeds of the rights offering are estimated to be approximately $162.4&#160;million after the deduction of estimated expenses.  We currently intend to use the net proceeds for research and development and general corporate purposes.  We may also use a portion of the net proceeds to acquire or invest in complementary businesses, products and technologies.  See the section entitled &#8220;Use of Proceeds.&#8221;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid 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style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;"><div style="overflow:hidden;height:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-6</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:672px;border-collapse:collapse;text-align:left;"><tr><td colspan="7"></td></tr><tr><td width="21px"></td><td width="24px"></td><td width="22px"></td><td width="209px"></td><td width="5px"></td><td width="373px"></td><td width="17px"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:22px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:22px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:22px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:22px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:22px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;height:22px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-right:1px solid #000000;border-top:1px solid #000000;"><div style="overflow:hidden;height:22px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-left:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:top;background-color:;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Risk Factors</font></div></td><td 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href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">QUESTIONS AND ANSWERS RELATING TO THE RIGHTS OFFERING </font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">The following are examples of what we anticipate will be common questions about the rights offering, but do not contain all of the information that may be important to you and may not address all of the questions you may have about the rights offering.  For a more detailed description of the terms and conditions of the rights offering, please see the section entitled &#8220;The Rights Offering.&#8221;</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Exercising the subscription rights and investing in our common stock involves risks.  The following questions and answers do not contain all of the information that you should consider before exercising your subscription rights and investing in our common stock.  You should read this entire prospectus supplement and the accompanying prospectus carefully, including the section entitled  &#8220;Risk Factors&#8221; and the financial statements and related notes and other information incorporated by reference in this prospectus supplement and the accompanying prospectus, before making an investment decision.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">What is the rights offering?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are distributing to holders of our common stock as of 5:00&#160;p.m., New York time, on November 21, 2011 or the &#8220;record date,&#8221; at no charge, non-transferable subscription rights to purchase shares of our common stock.  You will receive one subscription right for every share of our common stock you owned as of 5:00&#160;p.m., New York time, on the record date.  The subscription rights will be evidenced by a subscription rights certificate and election form.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">What is a subscription right?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each subscription right gives our stockholders the opportunity to purchase 0.427175 shares of our common stock for $1.13 per share and carries with it both a basic subscription privilege and an over-subscription privilege, as described below.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">How many shares may I purchase if I exercise my subscription rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each subscription right entitles you to purchase 0.427175 shares of our common stock for $1.13 per share.  For example, if you owned 100&#160;shares of our common stock on the record date, you would be granted 100 subscription rights and you would have the right to purchase 42 shares of our common stock (42.7175 rounded down to the nearest whole number) for an aggregate purchase price of $47.46.  You may exercise any number of your subscription rights, or you may choose not to exercise any subscription rights. We will not issue fractional shares of common stock in the rights offering, and holders will only be entitled to purchase a whole number of shares of common stock, rounded down to the nearest whole number a holder would otherwise be entitled to purchase.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">What is the basic subscription privilege?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each subscription right evidences a basic subscription privilege to purchase 0.427175 shares of our common stock at the subscription price of $1.13 per share.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">What is the over-subscription privilege?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each subscription right also evidences an over-subscription privilege to purchase additional shares of our common stock at the same subscription price per share as under the basic subscription privilege under certain circumstances.  You must have subscribed for the maximum number of shares permitted by your basic subscription privilege in order to exercise your over-subscription privilege.  You must indicate on your subscription rights certificate (or beneficial owner election form, in the case of shareholders that hold through a broker, dealer, custodian bank or other nominee) by the expiration date whether and to what extent you elect to exercise your over-subscription privilege.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If sufficient shares of common stock are available, we will seek to honor your over-subscription request in full.  However, if over-subscription requests exceed the aggregate number of shares of common stock available for sale pursuant to the over-subscription privilege, we will allocate the available shares of common stock pro rata among each eligible person properly exercising the over-subscription privilege in proportion to the number of shares of common stock each such person owned as of the record date.  If any person subscribes for a fewer number of shares pursuant to the over-subscription privilege than otherwise allocated to such person pursuant to this pro rata allocation, then such person will be allocated only that number of shares for which the person over-subscribed, and the remaining shares of common stock will be allocated among all other persons exercising in full their over-subscription privilege on a pro rata basis in proportion to the number of shares allocated to such persons pursuant to their over-subscription privileges.  The proration process will be repeated until all shares of common stock have been allocated or all over-subscription requests have been satisfied, whichever occurs earlier.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-8</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Am I required to exercise all of the rights I receive in the rights offering?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No.  You may exercise any number of your subscription rights, or you may choose not to exercise any subscription rights.  However, if you choose not to exercise your basic subscription privilege in full, the relative percentage of our shares of common stock that you own will decrease, and your voting and other rights will be diluted.  In addition, if you do not exercise your basic subscription privilege in full, you will not be entitled to participate in the over-subscription privilege.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Why are we conducting the rights offering?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are conducting the rights offering at the election of two of our largest stockholders, Invus, L.P. and Invus C.V., which we refer to collectively as &#8220;Invus.&#8221;  In June 2007, we entered into a securities purchase agreement with Invus, L.P., under which Invus, L.P. made an initial investment of approximately $205.5 million to purchase 50,824,986 shares of our common stock in August 2007.  Under the securities purchase agreement, as amended and supplemented, Invus has the right to require us to initiate a pro rata rights offering to our stockholders providing all stockholders with non-transferable rights to acquire shares of our common stock in an aggregate amount of up to approximately $163.0 million.  Invus exercised its right to require us to conduct such a rights offering on November 11, 2011.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Will Invus be exercising its subscription rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pursuant to the terms of the securities purchase agreement, as amended and supplemented, Invus is required to exercise its basic subscription privilege in full and purchase at least 68,868,892 shares of our common stock in the rights offering, subject to certain customary closing conditions.  See the section entitled &#8220;Arrangements with Invus.&#8221;</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Has our board of directors made a recommendation to our stockholders regarding the exercise of rights under the rights offering?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No.  Our board of directors is making no recommendation regarding the exercise of your subscription rights.  Stockholders who exercise their subscription rights risk loss on their investment.  We cannot assure you that the market price of our common stock will be above the subscription price or that anyone purchasing shares at the subscription price will be able to sell those shares in the future at the same price or a higher price.  You are urged to make your decision based on your own assessment of our business and financial condition, the terms of the rights offering and the information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">How was the subscription price of $1.13 per share determined?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pursuant to the terms of the securities purchase agreement, as amended and supplemented, Invus has the right to designate a subscription price in a range between $4.50 per share and the average of the volume weighted average trading prices of our common stock on the Nasdaq Global Select Market for the ten full trading days prior to such designation.  Invus designated a subscription price of $1.13 per share on November 11, 2011.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">How soon must I exercise my rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription rights will expire and will have no value if not exercised prior to December 22, 2011, at 5:00&#160;p.m., New York time, unless we and Invus agree to extend the rights offering period.  If you are a registered holder of our common stock, the subscription agent must receive your completed and signed subscription rights certificate and payment prior to the expiration of the rights offering.  If you hold your shares in street name through a broker, dealer, custodian bank or other nominee, your broker, dealer, custodian bank or other nominee may establish a deadline prior to December 22, 2011, at 5:00&#160;p.m. for the submission of instructions as to the exercise of your subscription rights.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">May I transfer my rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No.  Should you choose not to exercise your subscription rights, you may not sell, give away, or otherwise transfer your subscription rights.  Subscription rights will, however, be transferable by operation of law (for example, upon the death of the recipient).  Upon expiration of the rights offering, all unexercised rights will automatically expire.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Are we requiring a minimum subscription to complete the rights offering?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">There is no minimum subscription requirement in the rights offering.  However, with Invus' consent, we may cancel the rights offering at any time for any reason, including if we believe that there is insufficient participation by our stockholders.  If </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-9</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the rights offering is cancelled, all subscription payments received by the subscription agent will be returned promptly, without interest or penalty.  </font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Can the rights offering be canceled, terminated, amended or extended?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Yes.  With Invus' consent, we have the option to extend the rights offering and the period for exercising your subscription rights, although we do not presently intend to do so.  With Invus' consent, we may also cancel or terminate the rights offering at any time for any reason.  If the rights offering is cancelled or terminated, all subscription payments received by the subscription agent will be returned promptly, without interest or penalty.  With Invus' consent, we also reserve the right to amend or modify the terms of the rights offering for any reason.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">When will I receive the subscription rights certificate or other rights offering materials?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Promptly after the date of this prospectus supplement, the subscription agent will send a subscription rights certificate and election form to each registered holder of our common stock as of the close of business on the record date, based on our stockholder registry maintained by the transfer agent for our common stock.  If you hold your shares of common stock in street name through a broker, dealer, custodian bank or other nominee, you will not receive a subscription rights certificate and election form.  Instead, we will instruct your broker, dealer, custodian bank or other nominee to provide you with materials relating to the rights offering which you may use to direct your broker, dealer, custodian bank or other nominee to exercise your subscription rights on your behalf.  You should promptly contact your broker, dealer, custodian bank or other nominee if you believe you are entitled to participate in the rights offering, but have not received any rights offering materials.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">What will happen if I choose not to exercise my subscription rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you do not exercise any subscription rights, the number of our shares of common stock you own will not change.  Due to the fact that Invus is required to fully exercise its basic subscription right and shares may be purchased pursuant to the rights offering by other stockholders, your percentage ownership of our common stock will be diluted following completion of the rights offering, unless you fully exercise your basic subscription rights.  See the section entitled &#8220;Risk Factors - Your interest in us may be diluted as a result of this offering.&#8221;</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">How do I exercise my subscription rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a registered holder of shares of our common stock, you may exercise your subscription rights by delivering payment and a properly completed subscription rights certificate and election form to the subscription agent before 5:00 p.m., New York time, on December 22, 2011.  If you wish to exercise your over-subscription privilege, you should indicate on your completed subscription rights certificate and election form the number of shares you wish to purchase pursuant to your over-subscription privilege and include payment related to such shares.  Please follow the payment and delivery instructions accompanying the subscription rights certificate and election form.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you send a payment that is insufficient to purchase the number of shares you requested, or if the number of shares requested is not specified, your subscription rights will be exercised to the fullest extent possible based on the amount of the payment received, subject to the availability of shares under the over-subscription privilege and the elimination of fractional shares.  Any excess subscription payments received by the subscription agent will be returned promptly, without interest or penalty, following the expiration of the rights offering.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You may make delivery by mail or commercial carrier.  If regular mail is used for this purpose, we recommend using registered mail, properly insured, with return receipt requested.  We also urge you to allow sufficient time for delivery so that payment and the completed subscription rights certificate are received by the subscription agent by no later than the expiration date.  Please do not make any delivery relating to the rights offering directly to Lexicon.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">How do I exercise my subscription rights if my shares are held in the name of my broker, dealer, custodian bank or other nominee?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a beneficial owner of shares that are registered in the name of a broker, dealer, custodian bank or other nominee, you will not receive a subscription rights certificate and election form, and your broker, dealer, custodian bank or other nominee  must exercise your subscription rights on your behalf.  We will instruct your broker, dealer, custodian bank or other nominee to provide you with materials relating to the rights offering.  You may exercise your subscription rights by following the instructions contained in the rights offering materials in order to direct your broker, dealer, custodian bank or other nominee to exercise your subscription rights on your behalf.  Your broker, dealer, custodian bank or other nominee may establish a </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-10</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">deadline prior to December 22, 2011, at 5:00&#160;p.m. for the submission of instructions as to the exercise of your subscription rights.  You should promptly contact your broker, dealer, custodian bank or other nominee if you believe you are entitled to participate in the rights offering, but have not received any rights offering materials.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">When will I receive the shares of common stock I purchase in the rights offering?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a registered holder of shares of our common stock, our transfer agent will credit your account for the shares purchased in the rights offering and mail you a statement evidencing such shares as soon as practicable after the completion of the rights offering.  </font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a beneficial owner of shares that are registered in the name of a broker, dealer, custodian bank or other nominee, your broker, dealer, custodian bank or other nominee will be credited on your behalf for the shares of common stock you purchase in the rights offering as soon as practicable after the completion of the rights offering.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">After I exercise my subscription rights, can I change my mind and cancel my purchase?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">No.  Once you exercise and send in your subscription rights certificate and payment, you may not revoke the exercise of your subscription rights, even if Invus does not exercise its basic subscription privilege in full because the Invus Closing Conditions are not satisfied or you later learn information that you consider to be unfavorable to the exercise of your subscription rights.  See the section entitled &#8220;Arrangements with Invus.&#8221;  You should not exercise your subscription rights unless you are certain that you wish to purchase additional shares of our common stock at a subscription price of $1.13 per share.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">How many shares of common stock will be outstanding after the rights offering?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As of November 21, 2011, 337,677,864 shares of our common stock were outstanding.  The number of shares of our common stock that will be outstanding after the rights offering will depend on the number of shares that are purchased in the rights offering.  If we sell all of the shares offered in the rights offering and issue no additional shares of our common stock pursuant to the exercise of stock options or vesting of restricted stock units, then 481,925,406 shares of common stock will be outstanding after the closing of the rights offering.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Are there risks in exercising my subscription rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Yes.  The exercise of your subscription rights involves risks.  Exercising your subscription rights involves the purchase of additional shares of common stock and should be considered as carefully as you would consider any other equity investment.  Please see the section entitled &#8220;Risk Factors.&#8221; </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">If the rights offering is not completed, will my subscription payment be refunded to me?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Yes.  The subscription agent will hold all funds it receives in a segregated bank account until completion of the rights offering.  If the rights offering is not completed, all subscription payments received by the subscription agent will be returned promptly, without interest or penalty.  If you own shares in street name through a broker, dealer, custodian bank or other nominee, the subscription agent will return payments through the record holder of your shares, which may result in a longer period for you to receive payment.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">How do I exercise my rights if I live outside the United States?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">This prospectus supplement, the accompanying prospectus and the subscription rights certificates will not be delivered to stockholders whose addresses are outside the United States or who have an Army Post Office or foreign post office address.  If you are a foreign stockholder or a stockholder with an Army Post Office or foreign post office address, you must notify the subscription agent prior to 11:00&#160;a.m., New York time, at least three business days prior to the expiration of the rights offering of your exercise of such rights and, if your address is outside the United States, provide satisfactory evidence that the exercise of such rights does not violate the laws of your jurisdiction.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">What fees or charges apply if I purchase the shares of common stock?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are not charging any fee or sales commission to issue subscription rights to you or to issue shares to you if you exercise your subscription rights.  If you exercise your subscription rights through your broker, dealer, custodian bank or other nominee, you are responsible for paying any fees charged by your broker, dealer, custodian bank or other nominee.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-11</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">What are the material United States federal income tax consequences of exercising my subscription rights?</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For United States federal income tax purposes, you will not recognize income or loss upon receipt or exercise of subscription rights.  However, you should consult your tax advisor as to your particular tax consequences resulting from the rights offering.  Please see the section entitled &#8220;Material United States Federal Income Tax Consequences.&#8221; </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">To whom should I send my forms and payment?</font></div><div style="line-height:120%;padding-bottom:4px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a registered holder of our common stock, you should send your payment and properly completed subscription rights certificate and election form by hand delivery, first class mail or courier service to: </font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:83.984375%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="48%"></td><td width="2%"></td><td width="50%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">If Delivering by Mail:</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">If Delivering by Hand or Courier:</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">BNY Mellon Shareowner Services</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">BNY Mellon Shareowner Services</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Attn:Corporate Action Department, 27</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">th</sup></font><font style="font-family:inherit;font-size:10pt;">&#160;Floor</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Attn:Corporate Action Department, 27</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">th</sup></font><font style="font-family:inherit;font-size:10pt;">&#160;Floor</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">P.O. Box 3301</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">480 Washington Boulevard</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">South Hackensack, New Jersey 07606</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Jersey City, New Jersey 07310</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:10px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Your payment of the subscription price must be made in United States dollars for the full number of shares of our common stock for which you are subscribing by cashier's or certified check or bank draft drawn upon a United States bank payable to the subscription agent at the address set forth above.  You are solely responsible for completing delivery to the subscription agent of your subscription materials.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If your shares are held in the name of a broker, dealer, custodian bank or other nominee, you should send your subscription documents to that record holder and follow the instructions contained in the rights offering materials delivered to you.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Whom should I contact if I have other questions?</font></div><div style="line-height:120%;padding-bottom:8px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you have any questions about the rights offering or wish to request another copy of a document, please contact BNY Mellon Shareowner Services, our information agent, from within the U.S., Canada or Puerto Rico toll free at (800) 777-3674, or if you are located outside of the U.S., at (201) 680-6579.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-12</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="sD308360F388906C8AB5664A91CDFF1A7"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">RISK FACTORS</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">You should carefully consider the risk factors and all other information contained or incorporated by reference in this prospectus supplement and the accompanying prospectus before purchasing shares of our common stock.  Investing in our common stock involves a high degree of risk.  In particular, you should carefully consider and evaluate the risks and uncertainties described in &#8220;Part&#160;I&#160;- Item&#160;1A. Risk Factors&#8221; of our most recent Form&#160;10-K for the year ended December&#160;31, 2010 and in &#8220;Part&#160;II&#160;- Item&#160;1A. Risk Factors&#8221; of our Form&#160;10-Q for the quarterly period ended September&#160;30, 2011, in each case as updated by the additional risks and uncertainties set forth in other filings we make with the SEC.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Risks Relating to the Rights Offering </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Your interest in us may be diluted as a result of this offering.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Stockholders who do not fully exercise their basic subscription rights should expect that they will, at the completion of this offering, own a smaller proportional interest in us than would otherwise be the case had they fully exercised their rights.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">You could be committed to buying shares of common stock above the prevailing market price.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Once you exercise your rights, you may not revoke such exercise even if you later learn information that you consider to be unfavorable to the exercise of your subscription rights.  Our shares of common stock are traded on the Nasdaq Global Select Market under the symbol &#8220;LXRX.&#8221;  On November 11, 2011, the last trading day before this offering was publicly announced, the closing price of our shares of common stock on the Nasdaq Global Select Market was $1.16 per share.  On November&#160;21, 2011, the last trading day before the commencement of this offering, the closing price of our shares of common stock was $1.02 per share.  We cannot assure you that the market price of our shares of common stock will not decline prior to the expiration of this offering or that, after shares of common stock are issued upon exercise of rights, a subscribing rights holder will be able to sell shares of common stock purchased in this offering at a price greater than or equal to the subscription price.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">The subscription price determined for this offering may not be an indication of the value of our common stock.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pursuant to the terms of our securities purchase agreement with Invus, L.P., as amended and supplemented, Invus has the right to designate a subscription price in a range between $4.50 per share and the average of the volume weighted average trading prices of our common stock on the Nasdaq Global Select Market for the ten full trading days prior to such designation.  Invus designated a subscription price of $1.13 per share on November 11, 2011.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription price may not be an indication of the value of our common stock.  We cannot assure you that the market price for our common stock during the rights offering will be equal to or above the subscription price or that a subscribing owner of rights will be able to sell the shares of common stock purchased in the rights offering at a price equal to or greater than the subscription price.  We urge you to obtain a current quote for our common stock before exercising your subscription rights.  After the date of this prospectus supplement, our common stock may trade at prices below the subscription price.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">We will have broad discretion in the use of the net proceeds from this offering and may not use them in ways that increase the value of your investment.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will generally have broad discretion in determining how the net proceeds from this offering will be used.  Our management may not use the net proceeds in ways that increase the value of your investment, and you will be relying on the judgment of our management regarding the application of these proceeds.  We currently intend to use the net proceeds for research and development and may also use a portion of the net proceeds to acquire or invest in complementary businesses, products and technologies or for general corporate purposes.  We have not otherwise allocated the net proceeds from this offering for any specific purposes.  Until we use the net proceeds, we plan to invest them, and these investments may not yield a favorable rate of return.  If we do not invest or apply the net proceeds from this offering in ways that enhance stockholder value, we may fail to achieve expected financial results, which could cause our stock price to decline.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">If we cancel or terminate this offering, neither we nor the subscription agent will have any obligation to you except to return your subscription payments.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may cancel or terminate this offering only with the consent of Invus.  If we cancel or terminate this offering, neither we nor the subscription agent will have any obligation with respect to rights that have been exercised except to return, without interest or deduction, any subscription payments the subscription agent received from you.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">If you do not act on a timely basis and follow subscription instructions, your exercise of rights may be rejected.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Holders of shares of common stock who desire to purchase shares of our common stock in this offering must act on a timely basis to ensure that all required forms and payments are actually received by the subscription agent prior to 5:00 p.m., New </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-13</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:8px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">York time, on the expiration date, unless extended.  If you are a beneficial owner of shares of common stock and you wish to exercise your rights, you must act promptly to ensure that your broker, custodian bank or other nominee acts for you and that all required forms and payments are actually received by your broker, custodian bank or other nominee in sufficient time to deliver such forms and payments to the subscription agent to exercise the rights granted in this offering that you beneficially own prior to 5:00 p.m., New York time on the expiration date, unless extended.  We will not be responsible if your broker, custodian or nominee fails to ensure that all required forms and payments are actually received by the subscription agent prior to 5:00 p.m., New York time, on the expiration date, unless extended.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you fail to complete and sign the required subscription forms, send an incorrect payment amount, or otherwise fail to follow the subscription procedures that apply to your exercise in this offering, the subscription agent may, depending on the circumstances, reject your subscription or accept it only to the extent of the payment received.  Neither we nor the subscription agent undertakes to contact you concerning an incomplete or incorrect subscription form or payment, nor are we under any obligation to correct such forms or payment.  We have the sole discretion to determine whether a subscription exercise properly follows the subscription procedures.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">If the rights offering is not fully subscribed, Invus may increase its ownership.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On the record date for the rights offering, Invus and its affiliates beneficially owned approximately 48.9% of our outstanding common stock.  As holders of our common stock as of the record date, Invus and its affiliates will have the right to subscribe for and purchase shares of our common stock under the basic subscription right of the rights offering and will have the right to participate in the over-subscription privilege.  To the extent that Invus and its affiliates and other holders of our common stock exercise their basic subscription rights and any over-subscription rights, the ownership percentage of Invus and its affiliates of our outstanding common stock may increase or decrease, including to over 50% of our outstanding common stock and, if Invus and its affiliates exercise their basic subscription right in full and are the only holders of rights who exercise the basic subscription right, up to approximately 57.7% of our outstanding common stock.  In addition, the ownership percentage of Invus and its affiliates may further increase depending on the extent to which Invus and its affiliates exercise their over-subscription rights under such circumstances.  Your interests as a holder of common stock may differ materially from the interests of Invus.  See &#8220;-If as a result of the rights offering Invus' ownership percentage exceeds 50% of our outstanding common stock, certain restrictions on Invus contained in our stockholders' agreement may terminate.&#8221;</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">If as a result of the rights offering Invus' ownership percentage exceeds 50% of our outstanding common stock, certain restrictions on Invus contained in our stockholders' agreement may terminate.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Under the stockholders' agreement we entered into in connection with Invus, L.P.'s $205.5 million initial investment in our common stock, Invus currently has the right to designate the greater of three members or 30% (or the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates, if less than 30%) of all members of our board of directors, rounded up to the nearest whole number of directors, pursuant to which Invus has designated Raymond Debbane, president and chief executive officer of The Invus Group, LLC, an affiliate of Invus, and Philippe J. Amouyal and Christopher J. Sobecki, each of whom are managing directors of The Invus Group, LLC.&#160;&#160;In the event that the number of shares of our common stock owned by Invus and its affiliates ever exceeds 50% of the total number of shares of our common stock then outstanding (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement), from and after that time, Invus will have the right to designate a number of directors equal to the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates, rounded up to the nearest whole number of directors.&#160;&#160;The directors appointed by Invus have proportionate representation on the compensation and corporate governance committees of our board of directors. </font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In addition, Invus is subject to standstill provisions restricting its ability to purchase or otherwise acquire additional shares of common stock from third parties to an amount that would result in its ownership of our common stock not exceeding 49% of the total number of shares outstanding.  These standstill provisions will not apply to acquisitions of securities by way of stock splits, stock dividends, reclassifications, recapitalizations, or other distributions by us or acquisitions contemplated by the securities purchase agreement and the stockholders' agreement, including in the rights offering and upon Invus' exercise of preemptive rights under the stockholders' agreement.</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Except for acquisitions pursuant to the provisions described above, and subject to certain exceptions, Invus has agreed that it will not, and will cause its affiliates not to, without the approval of our unaffiliated board, directly or indirectly:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">solicit proxies to vote any of our voting securities or any voting securities of our subsidiaries;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">submit to our board of directors a written proposal for any merger, recapitalization, reorganization, business combination or other extraordinary transaction involving an acquisition of us or any of our subsidiaries or any of our or our subsidiaries' securities or assets by Invus and its affiliates; </font></div></td></tr></table><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-14</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">enter into discussions, negotiations, arrangements or understandings with any third party with respect to any of the foregoing; or </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">request us or any of our representatives, directly or indirectly, to amend or waive any of these standstill provisions. </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The standstill provisions of the stockholders' agreement will terminate on the earliest to occur of (a) August 28, 2017, (b) the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%, (c) the date on which the percentage of all of the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement), (d) the date on which any third party makes a public proposal to acquire (by purchase, exchange, merger or otherwise) assets or business constituting 50% or more of our revenues, net income or assets or 50% of any class of our equity securities our board of directors recommends or approves, or proposes to recommend or approve, any such transaction or (e) the date on which any third party acquires beneficial ownership (by purchase, exchange, merger or otherwise) of assets or business constituting 20% or more of our revenues, net income or assets or 20% of any class of our equity securities or our board of directors recommends or approves, or proposes to recommend or approve, any such transaction.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;Subject to certain exceptions, Invus has agreed that neither it nor its affiliates will sell any shares of common stock to third parties that are not affiliated with Invus if, to Invus' knowledge, such transfer would result in any such third party (or any person or group including such third party) owning more than 14.9% of the total number of outstanding shares of our common stock.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;The provisions of the stockholders' agreement relating to sales to third parties will terminate on the earliest to occur of (a)&#160;August 28, 2017, (b)&#160;the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%, and (c)&#160;the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus and its affiliates from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the standstill provisions of the stockholders' agreement).</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In any election of persons to serve on our board of directors, Invus will be obligated to vote all of the shares of common stock held by it and its affiliates in favor of the directors nominated by our board of directors, as long as we have complied with our obligation with respect to the designation of members of our board of directors described above and the individuals designated by Invus for election to our board of directors have been nominated, and, if applicable, are serving on our board of directors.&#160;&#160;With respect to all other matters submitted to a vote of the holders of our common stock, Invus will be obligated to vote any shares that it acquired from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement, in the same proportion as all the votes cast by other holders of our common stock, unless Invus and we (acting with the approval of the unaffiliated board) agree otherwise.&#160;&#160;Invus may vote all other shares of our common stock held by it in its sole discretion.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;The provisions of the stockholders' agreement relating to voting will terminate on the earliest to occur of (a)&#160;August&#160;28, 2017, (b)&#160;the date on which the percentage of all the outstanding shares of our common stock held by Invus and its affiliates falls below 10%, (c)&#160;the date on which the percentage of all outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the provisions of the stockholders' agreement), and (d)&#160;the termination of the standstill provisions in accordance with the stockholders' agreement.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;If as a result of the rights offering the percentage of all outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the provisions of the stockholders' agreement), the provisions of the stockholders' agreement discussed above may or will terminate, and Invus may or will have the ability to designate a majority of the members of our board of directors and to control actions to be taken by us, including amendments to our certificate of incorporation and bylaws and the approval of significant corporate transactions, including mergers, sales of substantially all of our assets, distributions of our assets and the incurrence of indebtedness. Your interests as a holder of common stock may differ materially from the interests of Invus.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-15</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:13px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">You will not be able to sell the shares of common stock you buy in the rights offering until your account is credited with the common stock.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you purchase shares in the rights offering by submitting a subscription rights certificate and payment, our transfer agent will credit your account for the shares purchased in the rights offering and mail you a statement evidencing such shares as soon as practicable after December 22, 2011, or such later date as to which the rights offering may be extended.  If your shares are held by a broker, dealer, custodian bank or other nominee and you purchase shares, your account with your nominee will be credited with the shares of our common stock you purchased in the rights offering as soon as practicable after the expiration of the rights offering, or such later date as to which the rights offering may be extended.  Until your account is credited, you may not be able to sell your shares even though the common stock issued in the rights offering will be listed for trading on the Nasdaq.  The stock price may decline between the time you decide to sell your shares and the time you are actually able to sell your shares.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:13px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For more information about our SEC filings, please see the sections entitled &#8220;Where You Can Find More Information&#8221; and &#8220;Documents Incorporated By Reference.&#8221;  See also the section entitled &#8220;Special Note Regarding Forward-Looking Statements.&#8221;</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-16</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="s7F6452D383337A2B5F9B64A91D119368"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;padding-top:8px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">This prospectus supplement, the accompanying prospectus and the documents incorporated by reference into this prospectus supplement and the accompanying prospectus contain certain information regarding our financial projections, plans and strategies that are forward-looking statements within the meaning of Section 27A of the Securities Act and 21E of the Exchange Act.  We have attempted to identify forward-looking statements by terminology including &#8220;anticipate,&#8221; &#8220;believe,&#8221; &#8220;can,&#8221; &#8220;continue,&#8221; &#8220;could,&#8221; &#8220;estimate,&#8221; &#8220;expect,&#8221; &#8220;intend,&#8221; &#8220;may,&#8221; &#8220;plan,&#8221; &#8220;potential,&#8221; &#8220;predict,&#8221; &#8220;should&#8221; or &#8220;will&#8221; or the negative of these terms or other comparable terminology.  These statements, which are only predictions and involve known and unknown risks, uncertainties and other important factors may include, among other things, statements which address our strategy and operating performance, events or developments that we expect or anticipate will occur in the future, such as projections of our future results of operations or of our financial condition, the status of any collaborative agreements or clinical trials, the expected timing of the completion of our ongoing and future clinical trials and the results of such trials, including top-line data, expected timing of initiation of our planned clinical trials, expected enrollment in our ongoing and future clinical trials, and our research and development efforts and anticipated trends in our business.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have based these forward-looking statements on our current expectations and projections about future events.  However, there may be events in the future that we are not able to predict accurately or which we do not fully control that could cause actual results to differ materially from those expressed or implied in our forward-looking statements.  Many important factors could cause actual results to differ materially from those expressed or implied by these forward-looking statements, including those discussed under &#8220;Risk Factors&#8221; in this prospectus supplement and other sections of the documents incorporated by reference into this prospectus supplement and the accompanying prospectus.  Except as required by applicable law, we undertake no obligation to publicly release any revisions to the forward-looking statements or reflect events or circumstances after the date of this prospectus supplement.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-17</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="sA9AA2F55F398EE69EC3764A91D1B5768"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">MARKET PRICE OF OUR COMMON STOCK AND RELATED STOCKHOLDER MATTERS</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our common stock is quoted on the Nasdaq Global Select Market under the symbol &#8220;LXRX.&#8221;  The following table sets forth, for the periods indicated, the high and low sales prices for our common stock as reported on the Nasdaq Global Select Market, and previously on the Nasdaq Global Market.</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New 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style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Low</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">2009</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">First Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font 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style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">0.94</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Third 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style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.11</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Fourth Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font 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style="font-family:inherit;font-size:10pt;">1.30</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">2010</font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">First Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">2.87</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.20</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Second Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.69</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.19</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Third Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.63</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.17</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Fourth Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.91</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.22</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">2011</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">First Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">2.30</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.44</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Second Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.87</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.33</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Third Quarter</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.85</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">0.92</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Fourth Quarter (through November</font><font style="font-family:inherit;font-size:10pt;">&#160;21,</font><font style="font-family:inherit;font-size:10pt;">&#160;2011)</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1.31</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">0.81</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr></table></div></div><div style="line-height:120%;text-align:left;font-size:6pt;"><font style="font-family:inherit;font-size:6pt;"><br></font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As of October 31, 2011, there were approximately 216 holders of record of our common stock.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On November 11, 2011, the last trading day before this offering was publicly announced, the closing price of our shares of common stock on the Nasdaq Global Select Market was $1.16 per share.  On November 21, 2011, the last trading day before the commencement of this offering, the closing price of our shares of common stock was $1.02 per share</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have never paid cash dividends on our common stock. We anticipate that we will retain all of our future earnings, if any, for use in the expansion and operation of our business and do not anticipate paying cash dividends in the foreseeable future.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-18</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="sBB4179587472005C8CC6AE4C98B20CF1"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">ARRANGEMENTS WITH INVUS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In June 2007, we entered into a securities purchase agreement with Invus, L.P., under which Invus, L.P. made an initial investment of approximately $205.5 million to purchase 50,824,986 shares of our common stock in August 2007.  Under the securities purchase agreement, as amended and supplemented (the &#8220;securities purchase agreement&#8221;), and after accounting for the $181.5 million in net proceeds from our public offering and concurrent private placement of common stock in March 2010, Invus has the right to require us to initiate a pro rata rights offering to our stockholders providing all stockholders with non-transferable rights to acquire shares of our common stock in an aggregate amount of up to approximately $163.0 million. On November 11, 2011, Invus exercised its right to require us to conduct such a rights offering at a subscription price of $1.13 per share and in the aggregate amount of $163.0 million.  Invus is required to exercise its basic subscription privilege in full and purchase at least 68,868,892 shares of our common stock in the rights offering, subject to certain customary closing conditions, including (1) the expiration or termination of any applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the &#8220;HSR Act&#8221;), (2) the accuracy (subject to materiality and material adverse effect qualifications) of our representations and warranties set forth in the securities purchase agreement, as of the closing of the rights offering (except that those representations and warranties that address matters only as of a particular date need only remain true and correct, subject to any materiality qualifiers, as of such date), (3) our performance or compliance in all material respects with the agreements and covenants to be performed by us under the securities purchase agreement and related ancillary agreements on or before the closing of the rights offering, (4) the delivery of a certificate signed by our president certifying as to the satisfaction of the closing conditions set forth in clauses (2) and (3) above, (5) the delivery of an opinion of counsel reasonably satisfactory to Invus and covering certain matters specified in the securities purchase agreement and (6) the delivery of certificates of good standing for us and our material subsidiaries (collectively, the &#8220;Invus Closing Conditions&#8221;).  Under the HSR Act and the rules promulgated thereunder by the Federal Trade Commission, or the FTC, the rights offering cannot be completed until (i) each of we and Invus file a notification and report form with the Premerger Notification Office of the FTC and the Antitrust Division of the Department of Justice seeking approval for Invus and its affiliates to increase their ownership percentage to greater than 50% of our outstanding common stock in the event that such threshold is reached as a result of the rights offering and (ii) the applicable waiting period has expired or been terminated. We and Invus filed such a notification and report form on November 15, 2011.  </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Under the securities purchase agreement, until the completion of the rights offering, we have agreed not to issue any of our common stock for a per share price of less than $4.50 without the prior written consent of Invus, except pursuant to an employee or director stock option, incentive compensation or similar plan or to persons involved in the pharmaceutical industry in connection with simultaneous strategic transactions involving such persons in the ordinary course.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Board of Directors</font><font style="font-family:inherit;font-size:10pt;">.  Concurrently with the execution of the securities purchase agreement, we entered into a stockholders' agreement with Invus, L.P. under which Invus has the right to designate the greater of three members or 30% (or the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates, if less than 30%) of all members of our board of directors, rounded up to the nearest whole number of directors, and pursuant to which Invus has designated Philippe J. Amouyal, Raymond Debbane and Christopher J. Sobecki.  Mr. Debbane is president and chief executive officer of The Invus Group, LLC, an affiliate of Invus, and Mr. Amouyal and Mr. Sobecki are each managing directors of The Invus Group, LLC.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In the event that the number of shares of our common stock owned by Invus and its affiliates ever exceeds 50% of the total number of shares of our common stock then outstanding (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement), from and after that time, Invus will have the right to designate a number of directors equal to the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates, rounded up to the nearest whole number of directors.  The directors appointed by Invus have proportionate representation on the compensation committee and corporate governance committee of our board of directors.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Invus' rights with respect to the designation of members of our board of directors and its compensation and corporate governance committees will terminate if the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%.  Invus will also have the right to terminate these provisions at any time following the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus and its affiliates from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the standstill provisions of the stockholders' agreement).</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Preemptive Rights</font><font style="font-family:inherit;font-size:10pt;">.  Invus has preemptive rights under the stockholders' agreement to participate in future equity issuances by us (including any qualified offering), subject to certain exceptions, so as to maintain its then-current percentage ownership of our capital stock.  Subject to certain limitations, Invus will be required to exercise its preemptive rights in advance with </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-19</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">respect to certain marketed offerings, in which case it will be obligated to buy its pro rata share of the number of shares being offered in such marketed offering, including any overallotment (or such lesser amount specified in its exercise of such rights), so long as the sale of the shares were priced within a range within 10% above or below the market price on the date we notified Invus of the offering and we met certain other conditions. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to preemptive rights will terminate on the earlier to occur of August&#160;28, 2017 and the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Standstill Provisions</font><font style="font-family:inherit;font-size:10pt;">.  Invus is subject to standstill provisions restricting its ability to purchase or otherwise acquire additional shares of common stock from third parties to an amount that would result in its ownership of our common stock not exceeding 49% of the total number of shares outstanding.  These standstill provisions will not apply to the acquisitions of securities by way of stock splits, stock dividends, reclassifications, recapitalizations, or other distributions by us, acquisitions contemplated by the securities purchase agreement and the stockholders' agreement, including in the rights offering and upon Invus' exercise of preemptive rights under the stockholders' agreement.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Except for acquisitions pursuant to the provisions described above, and subject to certain exceptions, Invus has agreed that it will not, and will cause its affiliates not to, without the approval of our unaffiliated board, directly or indirectly:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:72px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">solicit proxies to vote any of our voting securities or any voting securities of our subsidiaries;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:72px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">submit to our board of directors a written proposal for any merger, recapitalization, reorganization, business combination or other extraordinary transaction involving an acquisition of us or any of our subsidiaries or any of our or our subsidiaries' securities or assets by Invus and its affiliates;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:72px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">enter into discussions, negotiations, arrangements or understandings with any third party with respect to any of the foregoing; or</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:72px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:48px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">request us or any of our representatives, directly or indirectly, to amend or waive any of these standstill provisions.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The standstill provisions of the stockholders' agreement will terminate on the earliest to occur of (a) August 28, 2017, (b) the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%, (c) the date on which the percentage of all of the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement), (d) the date on which any third party makes a public proposal to acquire (by purchase, exchange, merger or otherwise) assets or business constituting 50% or more of our revenues, net income or assets or 50% of any class of our equity securities or our board of directors recommends or approves, or proposes to recommend or approve, any such transaction or (e) the date on which any third party acquires beneficial ownership (by purchase, exchange, merger or otherwise) of assets or business constituting 20% or more of our revenues, net income or assets or 20% of any class of our equity securities or our board of directors recommends or approves, or proposes to recommend or approve, any such transaction. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Sales to Third Parties</font><font style="font-family:inherit;font-size:10pt;">.  Subject to certain exceptions, Invus has agreed that neither it nor its affiliates will sell any shares of common stock to third parties that are not affiliated with Invus if, to Invus' knowledge, such transfer  would result in any such third party (or any person or group including such third party) owning more than 14.9% of the total number of outstanding shares of our common stock. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to sales to third parties will terminate on the earliest to occur of (a)&#160;August 28, 2017, (b)&#160;the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%, and (c)&#160;the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus and its affiliates from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the standstill provisions of the stockholders' agreement).</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Voting of Shares</font><font style="font-family:inherit;font-size:10pt;">.  In any election of persons to serve on our board of directors, Invus will be obligated to vote all of the shares of common stock held by it and its affiliates in favor of the directors nominated by our board of directors, as long as we have complied with our obligation with respect to the designation of members of our board of directors described above and the individuals designated by Invus for election to our board of directors have been nominated, and, if applicable, are serving on our board of directors.  With respect to all other matters submitted to a vote of the holders of our common stock, Invus will be </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-20</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">obligated to vote any shares that it acquired from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement, in the same proportion as all the votes cast by other holders of our common stock, unless Invus and we (acting with the approval of the unaffiliated board) agree otherwise.  Invus may vote all other shares of our common stock held by it in its sole discretion.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to voting will terminate on the earliest to occur of (a)&#160;August 28, 2017, (b)&#160;the date on which the percentage of all the outstanding shares of our common stock held by Invus and its affiliates falls below 10%, (c)&#160;the date on which the percentage of all outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the provisions of the stockholders' agreement), and (d)&#160;the termination of the standstill provisions in accordance with the stockholders' agreement.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Minority Protections</font><font style="font-family:inherit;font-size:10pt;">.  Invus is entitled to certain minority protections, including consent rights over (a) the creation or issuance of any new class or series of shares of our capital stock (or securities convertible into or exercisable for shares of our capital stock) having rights, preferences or privileges senior to or on parity with our common stock, (b) any amendment to our certificate of incorporation or bylaws, or amendment to the certificate of incorporation or bylaws of any of our subsidiaries, in a manner adversely affecting Invus' rights under the securities purchase agreement and the related agreements, (c) the repurchase, retirement, redemption or other acquisition of our or our subsidiaries' capital stock (or securities convertible into or exercisable for shares of our or our subsidiaries' capital stock), (d) any increase in the size of our board of directors to more than 12 members and (e) the adoption or proposed adoption of any stockholders' rights plan, &#8220;poison pill&#8221; or other similar plan or agreement, unless Invus is exempt from the provisions of such plan or agreement. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to minority protections will terminate on the earlier to occur of August 28, 2017 and the date on which Invus and its affiliates hold less than 15% of the total number of outstanding shares of our common stock.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Registration Rights</font><font style="font-family:inherit;font-size:10pt;">.  Concurrently with the execution of the securities purchase agreement, we entered into a registration rights agreement with Invus, L.P., pursuant to which Invus, L.P. and its affiliates have certain demand and piggyback registration rights with respect to shares of our common stock held by them.  Invus, L.P. and its affiliates which hold our common stock have waived these registration rights with respect to any offerings of our securities pursuant to this prospectus supplement and the accompanying prospectus.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-21</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="sD8223FF55816DBAAC17B64A91D4DCFA7"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">THE RIGHTS OFFERING</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">The Subscription Rights </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are distributing, at no charge, to the record holders of our common stock as of November 21, 2011, or the record date, non-transferable subscription rights to purchase additional shares of our common stock at a subscription price of $1.13 per share.  Each record holder will receive one subscription right for each share of common stock owned by such holder as of 5:00&#160;p.m., New York time on the record date, entitling such holder to both a basic subscription privilege and an over-subscription privilege.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription rights will entitle the holders of our common stock to purchase an aggregate of 144,247,542 shares of our common stock.  We intend to keep the rights offering open until December 22, 2011, unless our board of directors, with Invus' consent, extends such time period or otherwise terminates the rights offering.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Basic Subscription Privilege</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each basic subscription privilege entitles you to purchase 0.427175 shares of our common stock at the subscription price of $1.13 per share, upon delivery of the required documents and payment of the subscription price prior to the expiration of the rights offering.  You may exercise all or a portion of your basic subscription privilege; however, if you exercise less than your full basic subscription privilege, you will not be entitled to purchase shares pursuant to your over-subscription privilege.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will not issue fractional shares of common stock in the rights offering, and holders will only be entitled to purchase a whole number of shares of common stock, rounded down to the nearest whole number a holder would otherwise be entitled to purchase, with the total subscription payment being adjusted accordingly.  Any excess subscription payments received by the subscription agent will be returned promptly, without interest or penalty. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Over-Subscription Privilege </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You must have subscribed for the maximum number of shares permitted by your basic subscription privilege in order to exercise your over-subscription privilege.  You must indicate on your subscription rights certificate and election form (or beneficial owner election form, in the case of shareholders that hold through a broker, dealer, custodian bank or other nominee) by the expiration date whether and to what extent you elect to exercise your over-subscription privilege. If sufficient shares of common stock are available, we will seek to honor the over-subscription requests in full.  However, if over-subscription requests exceed the aggregate number of shares of common stock available for sale pursuant to the over-subscription privilege, we will allocate the available shares of common stock pro rata among each eligible person properly exercising the over-subscription privilege in proportion to the number of shares of common stock each such person owned as of the record date.  If any eligible person subscribes for a fewer number of shares pursuant to the over-subscription privilege than otherwise allocated to such person pursuant to this pro rata allocation, then such person will be allocated only that number of shares for which the person over-subscribed, and the remaining shares of common stock will be allocated among all other persons exercising in full their over-subscription privilege on a pro rata basis in proportion to the number of shares allocated to such persons pursuant to their over-subscription privileges.  The proration process will be repeated until all shares of common stock have been allocated or all over-subscription requests have been satisfied, whichever occurs earlier. </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you wish to exercise your over-subscription rights, you should indicate the number of additional shares that you would like to purchase in the space provided on your subscription rights certificate and election form or other rights offering materials provided by your broker, dealer, custodian bank or other nominee.  When you send in your subscription rights certificate and election form to the subscription agent or instructions to your broker, dealer, custodian bank or other nominee, you must also send payment for the full subscription price of the additional shares that you have requested to purchase (in addition to the payment due for shares purchased through your basic subscription rights).  As soon as practicable after the expiration date, the subscription agent will determine the number of shares of common stock that you may purchase pursuant to the over-subscription privilege.  If you request and pay for more shares than are allocated to you, the subscription agent will refund the overpayment promptly, without interest or penalty.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Method of Exercising Subscription Rights </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The exercise of subscription rights is irrevocable and may not be cancelled or modified, even if Invus does not exercise its basic subscription privilege in full because the Invus Closing Conditions are not satisfied or you later learn information that you consider to be unfavorable to the exercise of your subscription rights. You may exercise your subscription rights as follows: </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-22</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;padding-left:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Subscription by Registered Holders </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a registered holder of shares of our common stock, the number of rights you may exercise pursuant to the basic subscription privilege will be indicated on the subscription rights certificate and election form delivered to you.  You may exercise your subscription rights by properly completing and executing the subscription rights certificate and election form and forwarding it, together with your full subscription payment, to the subscription agent at the address set forth below in this section under the heading &#8220;Subscription Agent,&#8221; prior to the expiration of the rights offering. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;padding-left:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Subscription by DTC Participants </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We expect that the exercise of your subscription rights may be made through the facilities of the Depository Trust Company, or DTC. If your subscription rights are held of record through DTC, you may exercise your subscription rights by instructing DTC, or having your broker instruct DTC, to transfer your subscription rights from your account to the account of the subscription agent, together with certification as to the aggregate number of subscription rights you are exercising and the number of shares of our common stock you are subscribing for under your basic subscription privilege and your over-subscription privilege, if any, and your full subscription payment. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;padding-left:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Subscription by Beneficial Owners </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a beneficial owner of shares that are registered in the name of a broker, dealer, custodian bank or other nominee, you will not receive a subscription rights certificate and election form.  Instead, one subscription right will be issued to the nominee record holder on your behalf for each share of our common stock that you own at the record date.  We will instruct your broker, dealer, custodian bank or other nominee to provide you with materials relating to the rights offering.  You may exercise your subscription rights by following the instructions contained in the rights offering materials in order to direct your broker, dealer, custodian bank or other nominee to exercise your subscription rights on your behalf.  Your broker, dealer, custodian bank or other nominee may establish a deadline prior to the expiration date of the rights offering for the submission of instructions as to the exercise of your subscription rights.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You should promptly contact your broker, dealer, custodian bank or other nominee if you believe you are entitled to participate in the rights offering, but have not received any rights offering materials.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Method of Payment</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Payments must be made in full in United States dollars for the full number of shares of our common stock for which you are subscribing by cashier's or certified check or bank draft drawn upon a United States bank payable to the subscription agent at the address set forth below in this section under the heading &#8220;Subscription Agent.&#8221; </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Personal checks are not accepted. Payment received after the expiration of the rights offering may not be honored, and the subscription agent will return your payment to you promptly, without interest or penalty. </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Registered holders should read and follow the delivery and payment instructions accompanying the subscription rights certificate and election form.  DO NOT SEND RIGHTS OFFERING MATERIALS OR PAYMENTS DIRECTLY TO LEXICON PHARMACEUTICALS, INC.  We will not consider your subscription received until the subscription agent has received delivery of a properly completed and duly executed subscription rights certificate and election form and payment of the full subscription amount.  The risk of delivery of all documents and payments is borne by you or your nominee, not by the subscription agent or us.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The method of delivery of subscription rights certificates and election form and payment of the subscription amount to the subscription agent will be at the risk of the holders of subscription rights.  If sent by mail, we recommend that you send subscription materials and payments by overnight courier or by registered mail, properly insured, with return receipt requested, and that a sufficient number of days be allowed to ensure delivery to the subscription agent and clearance of payment prior to the expiration of the rights offering.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Unless a subscription rights certificate and election form provides that the shares of our common stock are to be delivered to the record holder of such rights or such certificate is submitted for the account of a bank or a broker, signatures on such subscription rights certificate and election form must be guaranteed by an &#8220;eligible guarantor institution&#8221; (as such term is defined in Rule 17Ad-15 of the Securities Exchange Act of 1934, as amended) that is a participant in the Securities Transfer Agents Medallion Program, the New York Stock Exchange Program Medallion Signature Program or the Stock Exchange Medallion Program, subject to any standards and procedures adopted by the subscription agent.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-23</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Missing or Incomplete Subscription Information</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you send a payment that is insufficient to purchase the number of shares you requested, or if the number of shares requested is not specified, your subscription rights will be exercised to the fullest extent possible based on the amount of the payment received, subject to the availability of shares under the over-subscription privilege and the elimination of fractional shares.  Any excess subscription payments received by the subscription agent will be returned promptly, without interest or penalty, following the expiration of the rights offering.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Subscription Price</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pursuant to the terms of our securities purchase agreement with Invus, L.P., as amended and supplemented, Invus has the right to designate a subscription price in a range between $4.50 per share and the average of the volume weighted average trading prices of our common stock on the Nasdaq Global Select Market for the ten full trading days prior to such designation.  Invus designated a subscription price of $1.13 per share on November 11, 2011.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We cannot assure you that the market price for our common stock during the rights offering will be equal to or above the subscription price or that a subscribing owner of rights will be able to sell the shares of common stock purchased in the rights offering at a price equal to or greater than the subscription price.  We urge you to obtain a current quote for our common stock before exercising your subscription rights.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">No Transfer of Subscription Rights</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription rights are not transferable.  Should you choose not to exercise your subscription rights, you may not sell, give away, or otherwise transfer your subscription rights.  Subscription rights will, however, be transferable by operation of law (for example, upon the death of the recipient).  Upon expiration of the rights offering, all unexercised rights will automatically expire.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">No Revocation of Exercise of Subscription Rights</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Once you submit your completed subscription rights certificate and election form to exercise any subscription rights, you will not be permitted to revoke or change the exercise or request a refund of monies paid.  All exercises of subscription rights are irrevocable, even if Invus does not exercise its basic subscription privilege in full because the Invus Closing Conditions are not satisfied or you later learn information that you consider to be unfavorable to the exercise of your subscription rights.  You should not exercise your subscription rights unless you are certain that you wish to purchase additional shares of our common stock at the subscription price.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Expiration Date and Amendments</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription period during which you may exercise your subscription rights expires at 5:00&#160;p.m., New York time, on December 22, 2011, which is the expiration of the rights offering.  If you do not exercise your subscription rights prior to that time, your subscription rights will expire and will no longer be exercisable.  We will not be required to issue shares of common stock to you if the subscription agent receives your subscription rights certificate and election form and subscription payment after that time, regardless of when the subscription rights certificate and election form and subscription payment were sent by you.  We have the option to extend the rights offering and the period for exercising your subscription rights, with Invus' consent, although we do not presently intend to do so.  With Invus' consent, we may extend the expiration of the rights offering by giving oral or written notice to the subscription agent prior to the expiration of the rights offering.  If we elect to extend the expiration of the rights offering, we will issue a press release announcing such extension no later than 9:00&#160;a.m., New York time, on the next business day after the most recently announced expiration of the rights offering.  With Invus' consent, we also reserve the right to amend or modify the terms of the rights offering for any reason.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Conditions, Withdrawal and Termination </font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">With Invus' consent, we reserve the right to withdraw the rights offering prior to the completion of the rights offering for any reason.  We may terminate the rights offering, in whole or in part, if at any time before completion of the rights offering there is any judgment, order, decree, injunction, statute, law or regulation entered, enacted, amended or held to be applicable to the rights offering that in the sole judgment of our board of directors and Invus would or might make the rights offering or its completion, whether in whole or in part, illegal or otherwise restrict or prohibit completion of the rights offering.  Pursuant to the terms of our securities purchase agreement with Invus,&#160;L.P., the closing of the rights offering is subject to the Invus Closing Conditions.  We or Invus, as applicable, may waive any of these conditions and choose to proceed with the rights offering even if one or more of the conditions do not occur.  If we cancel or terminate the rights offering, in whole or in part, all affected subscription rights will expire without value, and all excess subscription payments received by the subscription agent will be </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-24</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:16px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">returned promptly, without interest or penalty.  If we cancel or terminate the rights offering, we will issue a press release notifying stockholders of the cancellation or termination, and all subscription payments received by the subscription agent will be returned promptly, without interest or penalty.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Delivery of Shares of Common Stock Acquired in the Rights Offering </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a registered holder of shares of our common stock, our transfer agent will credit your account for the shares purchased in the rights offering and mail you a statement evidencing such shares as soon as practicable after the completion of the rights offering.  </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a beneficial owner of shares that are registered in the name of a broker, dealer, custodian bank or other nominee, your broker, dealer, custodian bank or other nominee will be credited on your behalf for the shares of common stock you purchase in the rights offering as soon as practicable after the completion of the rights offering.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Reasons for the Rights Offering </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are conducting the rights offering at the election of Invus.  In June 2007, we entered into a securities purchase agreement with Invus, L.P., under which Invus, L.P. made an initial investment of approximately $205.5 million to purchase 50,824,986 shares of our common stock in August 2007.  Under the securities purchase agreement, as amended and supplemented, Invus has the right to require us to initiate a pro rata rights offering to our stockholders providing all stockholders with non-transferable rights to acquire shares of our common stock in an aggregate amount of up to approximately $163.0 million.  Invus exercised its right to require us to conduct such a rights offering on November 11, 2011.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Participation by Invus in the Rights Offering</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pursuant to the terms of the securities purchase agreement, as amended and supplemented, Invus is required to exercise its basic subscription privilege in full, subject to the Invus Closing Conditions, and purchase at least 68,868,892 shares of our common stock in the rights offering, representing approximately 47.7% of the total number of shares available in the rights offering.  We and Invus have made the required filings with the Premerger Notification Office of the FTC and the Antitrust Division of the Department of Justice seeking approval for Invus and its affiliates to increase their ownership percentage to greater than 50% of our outstanding common stock in the event that such threshold is reached as a result of the rights offering.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Subscription Agent </font></div><div style="line-height:120%;padding-bottom:4px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription agent for this offering is BNY Mellon Shareowner Services. The address to which completed subscription rights certificates and subscription payments should be mailed or delivered is: </font></div><div style="line-height:120%;padding-bottom:10px;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:83.984375%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="49%"></td><td width="1%"></td><td width="50%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">If Delivering by Mail</font><font style="font-family:inherit;font-size:10pt;">:</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">If Delivering by Hand or Courier</font><font style="font-family:inherit;font-size:10pt;">:</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">BNY Mellon Shareowner Services</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">BNY Mellon Shareowner Services</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Attn:Corporate Action Department, 27th Floor</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Attn:Corporate Action Department, 27th Floor</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">P.O. Box 3301</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">480 Washington Boulevard</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">South Hackensack, New Jersey 07606</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Jersey City, New Jersey 07310</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You are solely responsible for completing delivery to the subscription agent of your subscription materials.  The subscription materials are to be received by the subscription agent on or prior to 5:00&#160;p.m., New York time, on December&#160;22, 2011. We urge you to allow sufficient time for delivery of your subscription materials to the subscription agent. If you deliver subscription materials in a manner different from those described in this prospectus supplement and the accompanying prospectus, we may not honor the exercise of your subscription rights. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Fees and Expenses </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are not charging any fee or sales commission to issue subscription rights to you or to issue shares to you if you exercise your subscription rights.  If you exercise your subscription rights through your broker, dealer, custodian bank or other nominee, you are responsible for paying any fees charged by your broker, dealer, custodian bank or other nominee.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Fractional Shares </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will not issue fractional shares.  Fractional shares of common stock resulting from the exercise of subscription rights will be eliminated by rounding down to the nearest whole share.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-25</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Medallion Guarantee May Be Required </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Your signature on each subscription rights certificate and election form must be guaranteed by an eligible institution, such as a member firm of a registered national securities exchange or a member of the Financial Industry Regulatory Authority, Inc., or a commercial bank or trust company having an office or correspondent in the United States, subject to standards and procedures adopted by the subscription agent, unless: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">your subscription rights certificate provides that shares are to be delivered to you as record holder of those subscription rights; or </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">you are an eligible institution.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You can obtain a signature guarantee from a financial institution - such as a commercial bank, savings, bank, credit union or broker dealer - that participates in one of the Medallion signature guarantee programs.  The three Medallion signature guarantee programs are the following: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Securities Transfer Agents Medallion Program (STAMP) whose participants include more than 7,000 U.S. and Canadian financial institutions. </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Stock Exchanges Medallion Program (SEMP) whose participants include the regional stock exchange member firms and clearing and trust companies. </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">New York Stock Exchange Medallion Signature Program (MSP) whose participants include NYSE member firms.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If a financial institution is not a member of a recognized Medallion signature guarantee program, it would not be able to provide signature guarantees. Also, if you are not a customer of a participating financial institution, it is likely the financial institution will not guarantee your signature.  Therefore, the best source of a Medallion Guarantee would be a bank, savings and loan association, brokerage firm, or credit union with which you do business.  The participating financial institution will use a Medallion imprint or stamp to guarantee the signature, indicating that the financial institution is a member of a Medallion signature guarantee program and is an acceptable signature guarantor. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Notice to Nominees </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you are a broker, dealer, custodian bank or other nominee holder that holds shares of our common stock for the account of others on the record date, you should notify the beneficial owners of the shares for whom you are the nominee of the rights offering as soon as possible to learn their intentions with respect to exercising their subscription rights.  You should obtain instructions from the beneficial owner, as set forth in the instructions we have provided to you for your distribution to beneficial owners.  If the beneficial owner so instructs, you should submit information and payment for shares.  We expect that the exercise of subscription rights on behalf of beneficial owners may be made through the facilities of DTC.  You may exercise individual or aggregate beneficial owner subscription rights by instructing DTC to transfer subscription rights from your account to the account of the subscription agent, together with certification as to the aggregate number of subscription rights exercised and the number of common shares subscribed for under the basic subscription privilege and the over-subscription privilege, if any, and your full subscription payment. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Validity of Subscriptions</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will resolve all questions regarding the validity and form of the exercise of your subscription rights, including time of receipt and eligibility to participate in the rights offering.  Our determination will be final and binding.  Once made, subscriptions and directions are irrevocable, and we will not accept any alternative, conditional or contingent subscriptions or directions.  We reserve the absolute right to reject any subscriptions or directions not properly submitted or the acceptance of which would be unlawful.  You must resolve any irregularities in connection with your subscriptions before the subscription period expires, unless waived by us in our sole discretion.  Neither we nor the subscription agent shall be under any duty to notify you or your representative of defects in your subscriptions.  A subscription will be considered accepted, subject to our right to withdraw or terminate the rights offering, only when a properly completed and duly executed subscription rights certificate and election form and any other required documents and the full subscription payment have been received by the subscription agent.  Our interpretations of the terms and conditions of the rights offering will be final and binding. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Escrow Arrangements; Return of Funds</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The subscription agent will hold funds received in payment for shares of our common stock in a segregated account pending completion of the rights offering.  The subscription agent will hold this money in escrow until the rights offering is completed or is withdrawn and canceled.  If the rights offering is canceled for any reason, all subscription payments received by the subscription agent will be returned promptly, without interest or penalty. </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-26</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Stockholder Rights</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You will have no rights as a holder of our shares of common stock you purchase in the rights offering, if any, until certificates representing our shares of common stock are issued to you or until your account with your broker, dealer, custodian bank or other nominee is credited with shares of common stock purchased in the rights offering.  You will have no right to revoke your subscriptions once made in accordance with the procedures set forth in this prospectus supplement and the accompanying prospectus. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Foreign Stockholders</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">This prospectus supplement, the accompanying prospectus and the subscription rights certificates and election form will not be delivered to stockholders whose addresses are outside the United States or who have an Amy Post Office or foreign post office address.  Rather, the subscription agent will hold subscription rights certificates and election form for their account.  To exercise their subscription rights, foreign stockholders or stockholders with an Army Post Office or foreign post office address must notify the subscription agent prior to 11:00&#160;a.m., New York time, at least three business days prior to the expiration of the rights offering of their exercise of such rights, and, with respect to holders whose addresses are outside the United States, provide evidence satisfactory to us, such as a legal opinion from local counsel, that the exercise of such rights does not violate the laws of the jurisdiction of such stockholder.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Material United States Federal Income Tax Consequences</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For United States federal income tax purposes, you will not recognize income or loss upon receipt or exercise of subscription rights. However, you should consult your tax advisor as to your particular tax consequences resulting from the rights offering.  Please see the section entitled &#8220;Material United States Federal Income Tax Consequences.&#8221;</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-27</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="sFB7D87979A94633FD1A364A91D610042"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">MATERIAL UNITED STATES FEDERAL INCOME TAX CONSEQUENCES</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following discussion summarizes the material United States federal income tax consequences of the rights offering to a holder of our common stock that is a United States holder (as defined below).  This summary is based upon provisions of the Internal Revenue Code of 1986, as amended, which we refer to as the &#8220;Code,&#8221; applicable United States Treasury regulations promulgated thereunder, published rulings and pronouncements of the United States Internal Revenue Service, which we refer to as the &#8220;IRS,&#8221; and judicial decisions in effect on the date hereof, all of which are subject to change (possibly with retroactive effect) and to differing interpretations.  No assurance can be given that the IRS would not assert, or that a court would not sustain, a position contrary to any of the tax consequences described below.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">This summary is for general information only and does not purport to discuss all aspects of United States federal income taxation that may be important to a particular holder in light of its particular circumstances or to holders that may be subject to special tax rules, including, but not limited to, partnerships or other pass-through entities, banks and other financial institutions, tax-exempt entities, employee stock ownership plans, certain former citizens or residents of the United States, insurance companies, regulated investment companies, real estate investment trusts, dealers in securities or currencies, brokers, traders in securities that have elected to use the mark-to-market method of accounting, persons holding subscription rights or shares of common stock as part of an integrated transaction, including a &#8220;straddle,&#8221; &#8220;hedge,&#8221; &#8220;constructive sale&#8221; or &#8220;conversion transaction,&#8221; persons whose functional currency for tax purposes is not the United States dollar, and persons subject to the alternative minimum tax provisions of the Code.</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">This summary applies to you only if you are a United States holder and receive your subscription rights in the rights offering, and you hold your subscription rights or shares of common stock issued to you upon exercise of the subscription rights or, if applicable, the over-subscription privilege, as capital assets for tax purposes.  This summary does not apply to you if you are not a United States holder. </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have not sought, and will not seek, a ruling from the IRS regarding the United States federal income tax consequences of the rights offering or the related share issuances.  The following summary does not address the tax consequences of the rights offering or the related share issuance under foreign, state, or local tax laws.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You are a &#8220;United States holder&#8221; if you are a beneficial owner of subscription rights or common stock and you are: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">An individual who is a citizen or resident of the United States for United States federal income tax purposes; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">A corporation (or other business entity treated as a corporation for United States federal income tax purposes) created or organized in or under the laws of the United States, or any political subdivision thereof, including the District of Columbia; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">An estate the income of which is subject to United States federal income tax regardless of its source; or </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">A trust (a) if a court within the United States can exercise primary supervision over its administration and one or more United States persons are authorized to control all substantial decisions of the trust or (b) that has a valid election in effect under applicable Treasury Regulations to be treated as a United States person.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If a partnership (including any entity treated as a partnership for United States federal income tax purposes) receives the subscription rights or holds the common stock received upon exercise of the subscription rights or, if applicable, the over-subscription privilege, the tax treatment of a partner in such partnership generally will depend upon the status of the partner and the activities of the partnership.  Such a partner or partnership is urged to consult its own tax advisor as to the United States federal income tax consequences of receiving and exercising the subscription rights and acquiring, holding or disposing of our common shares. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">EACH RECIPIENT OF RIGHTS IN THE RIGHTS OFFERING SHOULD CONSULT ITS OWN TAX ADVISOR WITH RESPECT TO THE TAX CONSEQUENCES OF THE RIGHTS OFFERING AND THE RELATED SHARE ISSUANCES THAT MAY RESULT FROM SUCH RECIPIENT'S PARTICULAR CIRCUMSTANCES.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The United States federal income tax consequences to a holder of our common stock of the receipt and exercise of subscription rights under the rights offering should be as follows:</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Distribution of Subscription Rights </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Your receipt of subscription rights pursuant to the rights offering will not be treated as a taxable distribution with respect to your existing shares of common stock for United States federal income tax purposes.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-28</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Tax Basis in the Subscription Rights</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If the fair market value of the subscription rights you receive is less than 15% of the fair market value of your existing shares of common stock on the date you receive the subscription rights, the subscription rights will be allocated a zero basis for United States federal income tax purposes, unless you elect to allocate your basis in your existing shares of common stock between your existing shares of common stock and the subscription rights in proportion to the relative fair market values of the existing shares of common stock and the subscription rights determined on the date of receipt of the subscription rights.  If you choose to allocate basis between your existing shares of common stock and the subscription rights, you must make this election on a statement included with your United States federal income tax return for the taxable year in which you receive the subscription rights. Such an election is irrevocable. </font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">However, if the fair market value of the subscription rights you receive is 15% or more of the fair market value of your existing shares of common stock on the date you receive the subscription rights, then you must allocate your basis in your existing shares of common stock between your existing shares of common stock and the subscription rights you receive in proportion to their fair market values determined on the date you receive the subscription rights.  The fair market value of the subscription rights on the date the subscription rights will be distributed is uncertain.  In determining the fair market value of the subscription rights, you should consider all relevant facts and circumstances. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Exercise of Subscription Rights</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Generally, you will not recognize gain or loss on the exercise of a subscription right received in the rights offering.  Your tax basis in a new share of common stock acquired when you exercise a subscription right will be equal to your adjusted tax basis in the subscription right, if any, allocated to the subscription rights, as described above, plus the subscription price paid for the common stock.  The holding period of a share of common stock acquired when you exercise your subscription rights will begin on the date of exercise.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Expiration of Subscription Rights</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you allow subscription rights received in the rights offering to expire, you will not recognize any gain or loss for United States federal income tax purposes, and you should re-allocate any portion of the tax basis in your existing shares of common stock previously allocated to the subscription rights that have expired to the existing shares of common stock.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Distributions with Respect to Common Stock Received Upon Exercise of Subscription Rights</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Distributions with respect to shares of common stock acquired upon exercise of subscription rights will be taxable as dividend income when actually or constructively received to the extent of our current or accumulated earnings and profits as determined for United States federal income tax purposes.  Subject to certain holding period and other requirements, such dividend income will generally be eligible for the dividends received deduction if you are a corporate United States holder and, in the case of dividends paid in taxable years beginning before January&#160;1, 2013, will generally be treated as &#8220;qualified dividend income&#8221; eligible for reduced rates of taxation if you are a non-corporate United States holder (including an individual).  To the extent that the amount of a distribution exceeds our current and accumulated earnings and profits, such distribution will be treated first as a tax-free return of capital, causing a reduction in your adjusted tax basis in such shares of common stock, and the balance in excess of adjusted basis will be taxed as capital gain.  We currently do not make any cash distributions on our shares of common stock. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Sale of Common Stock Acquired Upon Exercise of Subscription Rights</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you sell or otherwise dispose of the shares of common stock acquired upon exercise of the subscription rights, you will generally recognize capital gain or loss equal to the difference between the amount realized upon the sale and your adjusted tax basis in the shares of common stock.  Your adjusted tax basis in the shares of common stock will generally be equal to your initial tax basis in such shares at the time of the exercise of subscription rights, reduced by adjustments for any distributions with respect to such shares in excess of our current and accumulated earnings and profits (i.e., returns of capital).  Such capital gain or loss should be long-term if you  have held the shares for more than one year.  Generally, long-term capital gains recognized by individuals are taxable at a maximum rate of 15% (scheduled to increase to a maximum rate of 23.8% for taxable years beginning on or after January 1, 2013), and long-term capital gains recognized by corporations are taxable at ordinary corporate tax rates.  If you have held your shares for one year or less, your gain or loss on the sale of such shares will be short-term.  Short-term capital gains are generally taxed at the rates applicable to ordinary income.  Your ability to utilize any capital loss may be subject to substantial restrictions.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-29</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Information Reporting and Backup Withholding</font></div><div style="line-height:120%;padding-bottom:13px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You may be subject to information reporting and/or backup withholding at a rate of 28% with respect to distributions on or the gross proceeds from the disposition of our common stock.  Backup withholding may apply under certain circumstances if you (a)&#160;fail to furnish your social security or other taxpayer identification number, which we refer to as &#8220;TIN,&#8221; (b)&#160;furnish an incorrect TIN, (c)&#160;fail to report interest or dividends properly, or (d)&#160;fail to provide a certified statement, signed under penalty of perjury, that the TIN provided is correct, that you are not subject to backup withholding and that you are a United States person.  Any amount withheld from a payment under the backup withholding rules is allowable as a credit against (and may entitle you to a refund with respect to) your United States federal income tax liability, provided that the required information is furnished to the IRS.  Certain persons are exempt from information reporting and backup withholding, including corporations and financial institutions.  You are urged to consult your own tax advisor as to your qualification for exemption from information reporting and backup withholding and the procedure for obtaining such exemption. </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-30</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="s49E31C5699408CD85A7F64A91D76EA0D"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">CAPITALIZATION</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following table presents our unaudited capitalization and other data as of September 30, 2011 on an actual basis and as adjusted to give effect to the sale by us of 144,247,542 shares of common stock in the rights offering at a subscription price of $1.13 per share and after deducting estimated expenses.  To the extent the number of shares we sell in the rights offering is fewer than the number herein indicated, our net proceeds will be adjusted in proportion to such change.  Please see the section entitled &#8220;Use of Proceeds.&#8221;  You should read the following table in conjunction with the consolidated financial statements and the related notes incorporated by reference into this prospectus supplement and the accompanying prospectus. </font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:84.9609375%;border-collapse:collapse;text-align:left;"><tr><td colspan="9"></td></tr><tr><td width="61%"></td><td width="3%"></td><td width="1%"></td><td width="14%"></td><td width="1%"></td><td width="3%"></td><td width="1%"></td><td width="15%"></td><td width="1%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="7" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">As of September 30, 2011</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">Actual</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">As Adjusted</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="7" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;">(in thousands, except share data)</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Cash, cash equivalents, restricted cash and investments</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">144,155</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">306,555</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Long-term debt, net of current portion</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:3px double #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-top:2px;padding-bottom:2px;border-top:3px double #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">23,826</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;border-top:3px double #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:3px double #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;padding-top:2px;padding-bottom:2px;border-top:3px double #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">23,826</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;border-top:3px double #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Stockholders' equity:</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="3" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;border-top:1px solid #000000;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;padding-left:24px;text-indent:-24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Preferred stock, $0.01 par value; 5,000,000&#160;shares authorized, no shares issued and outstanding</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#8212;</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#8212;</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;padding-left:24px;text-indent:-24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Common stock, $0.001 par value; 900,000,000&#160;shares authorized;&#160;337,895,522 shares issued, actual; 482,143,064 shares issued, as adjusted</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">338</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">482</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Additional paid-in capital</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">925,230</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">1,087,486</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Accumulated deficit</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(755,776</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(755,776</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Accumulated other comprehensive gain</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">34</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">34</font></div></td><td style="vertical-align:bottom;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Treasury stock, at cost, 217,658 shares</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(345</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">)</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">(345</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;background-color:#cceeff;padding-right:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">)</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Total stockholders' equity</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">169,481</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">331,881</font></div></td><td style="vertical-align:bottom;border-bottom:1px solid #000000;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Total capitalization</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">193,307</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">$</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;padding-top:2px;padding-bottom:2px;border-top:1px solid #000000;"><div style="text-align:right;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">355,707</font></div></td><td style="vertical-align:bottom;border-bottom:3px double #000000;background-color:#cceeff;border-top:1px solid #000000;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:4px;text-align:left;text-indent:96px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</font></div><div style="line-height:120%;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The table above excludes 20,650,715 shares of common stock issuable upon the exercise of stock options outstanding as of September 30, 2011 at a weighted average exercise price of $2.85 per share, 2,518,100 shares of common stock issuable upon vesting of restricted stock units outstanding as of September 30, 2011 and 7,839,803 shares of common stock available for future grant or issuance under our stock incentive plans as of September 30, 2011.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-31</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="sBD975E95EE6D720ECBD664A91D8018E0"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">PLAN OF DISTRIBUTION</font></div><div style="line-height:120%;padding-bottom:4px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">On or about November 22, 2011, we will distribute the rights, subscription rights certificates and election form, and copies of this prospectus supplement and the accompanying prospectus to individuals who owned shares of common stock on the record date.  We have not employed any brokers, dealers, or underwriters in connection with the solicitation or exercise of the rights in the rights offering and no commissions, fees or discounts will be paid in connection with the rights offering.  While certain of our directors, officers and other employees may solicit responses from you, those directors, officers and other employees will not receive any commissions or compensation for their services other than their normal compensation.  If you wish to exercise your subscription rights and purchase shares of common stock, you must complete the subscription rights certificate and return it with payment for the shares to the subscription agent, at the following address: </font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:83.984375%;border-collapse:collapse;text-align:left;"><tr><td colspan="3"></td></tr><tr><td width="49%"></td><td width="1%"></td><td width="50%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">If Delivering by Mail</font><font style="font-family:inherit;font-size:10pt;">:</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;text-decoration:underline;">If Delivering by Hand or Courier</font><font style="font-family:inherit;font-size:10pt;">:</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">BNY Mellon Shareowner Services</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">BNY Mellon Shareowner Services</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Attn:Corporate Action Department, 27th Floor</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Attn:Corporate Action Department, 27th Floor</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">P.O. Box 3301</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">480 Washington Boulevard</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">South Hackensack, New Jersey 07606</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Jersey City, New Jersey 07310</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:12px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In the event that the rights offering is not fully subscribed pursuant to the basic subscription privilege, stockholders who purchased all of the shares available to them pursuant to their basic subscription privilege will have the opportunity to subscribe for unsubscribed rights pursuant to the over-subscription privilege.  Please see the section entitled &#8220;The Rights Offering.&#8221;</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pursuant to the terms of our securities purchase agreement with Invus, L.P., as amended and supplemented, Invus is required to exercise its basic subscription privilege in full and purchase at least 68,868,892 shares of our common stock in the rights offering, subject to the Invus Closing Conditions.  We do not know of any other existing agreements between any stockholder, broker, dealer, underwriter, or agent relating to the sale or distribution of the common stock underlying the rights.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you have any questions, you should contact us at:</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Investor Relations</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc.</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">8800 Technology Forest Place</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Woodlands, Texas 77381-1160</font></div><div style="line-height:120%;padding-bottom:16px;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Telephone: (281) 863-3000</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-32</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="s9515A6F0E21E4D58D50F64A91D9428CB"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#s432F8705E6CF381B375464A91C499A4B"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:12px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">USE OF PROCEEDS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We intend to use the net proceeds from the sale of common stock offered pursuant to this prospectus supplement and the accompanying prospectus for research and development and general corporate purposes, including capital expenditures and working capital needs.  We may also use some or all of the net proceeds to acquire or invest in businesses, products and technologies that are complementary to our own.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The amounts that we actually expend for working capital purposes, investments or acquisitions will vary significantly depending on a number of factors, including our future revenues, the amount of cash we generate from operations and the progress of our product development efforts.  Accordingly, our management will retain broad discretion in the allocation of the net proceeds from the sale(s) of the offered shares of common stock.</font></div><a name="sC25EFCC5F387622636EB64A91DA8B27A"></a><div style="line-height:120%;padding-bottom:12px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">LEGAL MATTERS</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The validity of the issuance of the shares of common stock offered by this prospectus supplement has been passed upon for us by Vinson&#160;&amp; Elkins L.L.P., Houston, Texas. </font></div><a name="sF8DAB274C5D05740CDC664A91DB2E002"></a><div style="line-height:120%;padding-bottom:12px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">EXPERTS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Ernst &amp; Young LLP, independent registered public accounting firm, has audited our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2010, as set forth in their report, which is incorporated by reference in this prospectus supplement and the accompanying prospectus.  Our financial statements are incorporated by reference in reliance on Ernst &amp; Young LLP's report, given on their authority as experts in accounting and auditing.</font></div><a name="s8C84CB1874F82DBE195264A91DC66516"></a><div style="line-height:120%;padding-bottom:12px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">WHERE YOU CAN FIND MORE INFORMATION</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We file reports, proxy statements and other information with the SEC.  You may read and copy the reports, proxy statements and other information that we file with the SEC at the SEC's Public Reference Room at 100 F Street, NE, Washington, D.C. 20549.  Please call the SEC at 1-800-SEC-0330 for information about the operation of its Public Reference Room and for its prescribed rates to obtain copies of such material.  The SEC also maintains a website that contains reports, proxy and information statements and other information regarding registrants, like us, that file electronically with the SEC.  The address of the SEC's Internet site is </font><font style="font-family:inherit;font-size:10pt;color:#0000ff;text-decoration:underline;">http://www.sec.gov</font><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and other filings with the SEC are available, free of charge, through our website, as soon as reasonably practicable after those reports or filings are electronically filed with or furnished to the SEC.  Information on our website or any other website is not incorporated by reference into this prospectus supplement or the accompanying prospectus and does not constitute a part of this prospectus supplement or the accompanying prospectus. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The SEC allows us to &#8220;incorporate by reference&#8221; information that we file with them, which means that we can disclose important information to you by referring you to documents previously filed with the SEC. The information incorporated by reference is an important part of this prospectus supplement, and the information that we later file with the SEC will automatically update and supersede this information. The following documents we filed with the SEC pursuant to the Exchange Act are incorporated herein by reference: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">our annual report on Form 10-K for the year ended December 31, 2010;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">our quarterly reports on Form 10-Q for the quarterly periods ended March 31, June 30 and September 30, 2011; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">our current reports on Form 8-K dated February 23, April 28 and August 12, 2011, our current report on Form 8&#8209;K/A dated July 30, 2010 and filed on March 16, 2011 and our current report on Form 8-K/A dated April 28, 2011 and filed on August 9, 2011; and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the description of our common stock contained in our registration statement on Form 8&#8209;A filed with the SEC on March 27, 2000 pursuant to Section 12 of the Securities Exchange Act of 1934, including any amendments and reports filed for the purpose of updating such description.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">These reports contain important information about us, our financial condition and our results of operations. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">All future documents filed pursuant to Sections&#160;13(a), 13(c), 14 and 15(d) of the Exchange Act (excluding any information furnished pursuant to Item&#160;2.02 or Item&#160;7.01 on any Current Report on Form&#160;8-K) before the termination of the offering of securities under this prospectus supplement shall be deemed to be incorporated in this prospectus supplement by reference and to be a part hereof from the date of filing of such documents. Any statement contained herein, or in a document incorporated or </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-33</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">deemed to be incorporated by reference herein, shall be deemed to be modified or superseded for purposes of this prospectus supplement to the extent that a statement contained herein or in any subsequently filed document that also is or is deemed to be incorporated by reference herein, modifies or supersedes such statement. Any such statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus supplement. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">You may request a copy of these filings at no cost by writing or telephoning us at the following address and telephone number: </font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Investor Relations</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc.</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">8800 Technology Forest Place</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Woodlands, Texas 77381-1160</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Telephone: (281) 863-3000</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">S-34</font><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="s2C48CE135DEFCA1C5C60B7D49FB38DA0"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:8pt;"><font style="font-family:Arial;font-size:8pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">$200,000,000</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;"><img src="logoa02.jpg" style="height:118px;width:265px;"></div><div style="line-height:120%;text-align:center;font-size:18pt;"><font style="font-family:inherit;font-size:18pt;font-weight:bold;">Lexicon Pharmaceuticals, Inc.</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">Common Stock</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">Preferred Stock</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">Debt Securities</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">Warrants</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">Rights</font></div><div style="line-height:120%;text-align:center;font-size:14pt;"><font style="font-family:inherit;font-size:14pt;font-weight:bold;">Units</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">__________________</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may offer common stock, preferred stock, debt securities, warrants and/or rights, either individually or in units, from time to time in one or more offerings in amounts, at prices and on terms to be determined in light of market conditions at the time of sale (including, without limitation, rights offered in a rights offering conducted pursuant to rights held by Invus, L.P. and Invus C.V. to require us to initiate a rights offering).  We may also offer common stock or preferred stock upon conversion of debt securities, common stock upon conversion of preferred stock or common stock, preferred stock or debt securities upon the exercise of warrants or rights.</font></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each time we sell these securities, we will provide a supplement to this prospectus that contains specific information about the offering.  The supplement may also add, update or change information contained in this prospectus.  You should carefully read this prospectus and any supplement before you invest.</font></div><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our common stock is listed on The Nasdaq Global Select Market under the symbol &#8220;LXRX&#8221;.  The prospectus supplement will contain information, where applicable, regarding any other listing on The Nasdaq Global Select Market or any securities exchange of the securities covered by the prospectus supplement.  The last reported sale price of our common stock on November 2, 2011 was $1.09 per share.</font></div><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:12pt;"><font style="font-family:inherit;font-size:12pt;font-weight:bold;">Investing in our securities involves risks.  See &#8220;Risk Factors&#8221; on page 4.</font></div><div style="line-height:120%;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Neither the Securities and Exchange Commission nor any other regulatory body has approved or disapproved of these securities or passed upon the accuracy or adequacy this prospectus. Any representation to the contrary is a criminal offense. </font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The date of this prospectus is November 7, 2011.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div style="text-align:center;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="sFABB0FF146405D11A61AC721A461EA33"></a><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">TABLE OF CONTENTS</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:88.28125%;border-collapse:collapse;text-align:left;"><tr><td colspan="4"></td></tr><tr><td width="40%"></td><td width="7%"></td><td width="46%"></td><td width="7%"></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;text-decoration:underline;">Page</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:9pt;"><font style="font-family:inherit;font-size:9pt;font-weight:bold;text-decoration:underline;">Page</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s0FA236FCB80A3128EFEAB7D4F5B0C573"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc.</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s0FA236FCB80A3128EFEAB7D4F5B0C573">3</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD07F871ABA8A863A1A3EB7D61ED921C2"><font style="font-family:inherit;font-size:10pt;">Ratio of Earnings to Fixed Charges</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sD07F871ABA8A863A1A3EB7D61ED921C2">16</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s34C4260DC9A5842B23C0B7D51A0E5E71"><font style="font-family:inherit;font-size:10pt;">Risk Factors</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s34C4260DC9A5842B23C0B7D51A0E5E71">4</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7676C22867E2B7BBD5AEB7D69D4C43EB"><font style="font-family:inherit;font-size:10pt;">Use of Proceeds</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s7676C22867E2B7BBD5AEB7D69D4C43EB">16</a></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s564DB571A055419668C6B7D5373C4D04"><font style="font-family:inherit;font-size:10pt;">Description of Capital Stock</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s564DB571A055419668C6B7D5373C4D04">4</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sF583A813A84FB8E81D11B7D6B638EBF0"><font style="font-family:inherit;font-size:10pt;">Plan of Distribution</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sF583A813A84FB8E81D11B7D6B638EBF0">16</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s9131D7EED20C8E27DC43B7DDDAAA581A"><font style="font-family:inherit;font-size:10pt;">Description of Debt Securities</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s9131D7EED20C8E27DC43B7DDDAAA581A">8</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s328ACEEF4486D8292135B7D7066E0BFA"><font style="font-family:inherit;font-size:10pt;">Legal Matters</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s328ACEEF4486D8292135B7D7066E0BFA">18</a></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s38EB0A25CFCAE1FE6D04B7D55A517FD6"><font style="font-family:inherit;font-size:10pt;">Description of Warrants</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s38EB0A25CFCAE1FE6D04B7D55A517FD6">10</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s959B130BC5B299FF1ED3B7D7339B231C"><font style="font-family:inherit;font-size:10pt;">Experts</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s959B130BC5B299FF1ED3B7D7339B231C">18</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBF7ED4D7E15A3DD74775B7D57FF9263A"><font style="font-family:inherit;font-size:10pt;">Description of Rights</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#sBF7ED4D7E15A3DD74775B7D57FF9263A">11</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s45AFCE0AF55FE061E866B7D767884215"><font style="font-family:inherit;font-size:10pt;">Where You Can Find More Information</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s45AFCE0AF55FE061E866B7D767884215">18</a></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s3B8C9E2F3411BD4A09E3B7D5A7BC4457"><font style="font-family:inherit;font-size:10pt;">Description of Units</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s3B8C9E2F3411BD4A09E3B7D5A7BC4457">12</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s4F4E773A4CB69D8C2349B7D7929F64DA"><font style="font-family:inherit;font-size:10pt;">Documents Incorporated by Reference</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s4F4E773A4CB69D8C2349B7D7929F64DA">18</a></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s05E391489B300328DA53B7D5C568D4FD"><font style="font-family:inherit;font-size:10pt;">Legal Ownership of Securities</font></a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s05E391489B300328DA53B7D5C568D4FD">13</a></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="padding-left:12px;text-indent:-12px;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s8FB9081BAAAAAF3CA839B7D5E9687E1A"><font style="font-family:inherit;font-size:10pt;">Special Note Regarding Forward Looking Statements</font></a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;font-family:Times New Roman;font-size:10pt;" href="#s8FB9081BAAAAAF3CA839B7D5E9687E1A">15</a></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;background-color:#cceeff;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:18px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr></table></div></div><div style="line-height:120%;text-align:center;font-size:11pt;"><font style="font-family:inherit;font-size:11pt;">____________</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">You should rely only on the information contained in this prospectus and documents incorporated into this prospectus by reference.  We have not authorized anyone to provide you with information different from that contained in this prospectus or the documents incorporated by reference herein.  This prospectus may only be used where it is legal to sell these securities.  The information contained in this prospectus, the documents incorporated by reference herein and any supplements to this prospectus are accurate only as of the dates of their respective covers or earlier dates as specified therein, regardless of the time of delivery of this prospectus or any supplement to this prospectus or of any sale of these securities.</font></div><div style="line-height:120%;padding-bottom:16px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">____________</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In this prospectus, &#8220;Lexicon,&#8221; &#8220;Lexicon Pharmaceuticals,&#8221; &#8220;we,&#8221; &#8220;us&#8221; and &#8220;our&#8221; refer to Lexicon Pharmaceuticals, Inc. and its subsidiaries.  We own or have rights to trademarks or trade names that we use in connection with the operation of our business.  The Lexicon name and logo, LexVision</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">&#174;</sup></font><font style="font-family:inherit;font-size:10pt;"> and OmniBank</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">&#174;</sup></font><font style="font-family:inherit;font-size:10pt;"> are registered trademarks and Genome5000</font><font style="font-family:inherit;font-size:10pt;"><sup style="vertical-align:top;line-height:120%;font-size:7pt">&#8482;</sup></font><font style="font-family:inherit;font-size:10pt;"> is a trademark of Lexicon Pharmaceuticals, Inc.</font></div><br><div style="text-align:center;"><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><hr style="page-break-after:always"><a name="s0FA236FCB80A3128EFEAB7D4F5B0C573"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">LEXICON PHARMACEUTICALS, INC.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc. is a biopharmaceutical company focused on the discovery and development of breakthrough treatments for human disease.  We have used our proprietary gene knockout technology and an integrated platform of advanced medical technologies to systematically study the physiological and behavioral functions of almost 5,000 genes in mice and assessed the utility of the proteins encoded by the corresponding human genes as potential drug targets.  We have identified and validated in living animals, or </font><font style="font-family:inherit;font-size:10pt;font-style:italic;">in vivo</font><font style="font-family:inherit;font-size:10pt;">, more than 100 targets with promising profiles for drug discovery.  For targets that we believe have high pharmaceutical value, we engage in programs for the discovery and development of potential new drugs.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have four drug programs for which we have completed Phase 2 clinical trials:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have completed a Phase&#160;2a clinical trial and are presently conducting a Phase&#160;2b clinical trial of LX4211, an orally-delivered small molecule compound that we are developing as a treatment for type 2 diabetes;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have completed a Phase&#160;2a clinical trial of LX1031, an orally-delivered small molecule compound that we are developing as a treatment for irritable bowel syndrome and other gastrointestinal disorders, and Phase&#160;1 clinical trials of LX1033, a more potent back-up molecule that we plan to advance into Phase&#160;2 clinical trials;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have completed a Phase&#160;2a clinical trial and are presently conducting an additional Phase&#160;2 clinical trial of LX1032, an orally-delivered small molecule compound that we are developing as a treatment for the symptoms associated with carcinoid syndrome; and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have completed a Phase&#160;2a clinical trial and have initiated a dose-ranging study to explore higher doses of LX2931, an orally-delivered small molecule compound that we are developing as a treatment for rheumatoid arthritis and other autoimmune diseases.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have also advanced small molecule compounds from a number of additional drug programs into various stages of preclinical development and research and believe that our systematic, target biology-driven approach to drug discovery will enable us to continue to expand our clinical pipeline.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We are working both independently and through strategic collaborations and alliances to capitalize on our technology, drug target discoveries and drug discovery and development programs.  Consistent with this approach, we seek to retain exclusive rights to the benefits of certain of our small molecule drug programs by developing drug candidates from those programs internally and to collaborate with third parties with respect to the discovery, development and commercialization of small molecule and biotherapeutic drug candidates for other targets, particularly when the collaboration provides us with access to expertise and resources that we do not possess internally or are complementary to our own.  We have established drug discovery and development collaborations with a number of leading pharmaceutical and biotechnology companies which generated near-term cash while offering us the potential to retain economic participation in products our collaborators develop through the collaboration.  In addition, we have established collaborations and license agreements with other leading pharmaceutical and biotechnology companies, research institutes and academic institutions under which we received fees and, in some cases, are eligible to receive milestone and royalty payments, in return for granting access to some of our technologies and discoveries.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc. was incorporated in Delaware in July 1995, and commenced operations in September 1995.  Our corporate headquarters are located at 8800 Technology Forest Place, The Woodlands, Texas 77381, and our telephone number is (281) 863-3000.  Our common stock is listed on The Nasdaq Global Select Market under the symbol &#8220;LXRX.&#8221;</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, or Exchange Act, are made available free of charge on our corporate website located at www.lexpharma.com as soon as reasonably practicable after the filing of those reports with the Securities and Exchange Commission, or SEC.  Information found on our website is not incorporated by reference into this prospectus and should not be considered part of this document.</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">3</font></div></div><hr style="page-break-after:always"><a name="s34C4260DC9A5842B23C0B7D51A0E5E71"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">RISK FACTORS</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">You should carefully consider the risk factors and all other information contained in this prospectus and any prospectus supplement and incorporated herein by reference before purchasing our securities.  Investing in our securities involves a high degree of risk.  </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For a discussion of these risks, please see:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our most recent annual report on Form 10-K, and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our other filings with the SEC that are incorporated by reference into this prospectus.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For more information about our SEC filings, please see &#8220;Where You Can Find More Information&#8221; on page 22 and &#8220;Documents Incorporated By Reference&#8221; on page 22 of this prospectus.  See also &#8220;Special Note Regarding Forward-Looking Statements&#8221; on page 19 of this prospectus.</font></div><a name="s564DB571A055419668C6B7D5373C4D04"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">DESCRIPTION OF CAPITAL STOCK </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our authorized capital stock consists of 900 million shares of common stock, $0.001 par value, and five million shares of preferred stock, $0.01 par value.  As of September 30, 2011, there were 337,895,522 shares of our common stock issued and outstanding, 217,658 shares of our common stock issued and held in treasury and no shares of preferred stock outstanding.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following summary description of our capital stock is based on the provisions of our restated certificate of incorporation, as amended, restated bylaws and the applicable provisions of the Delaware General Corporation Law.  This information may not be complete in all respects and is qualified entirely by reference to the provisions of our restated certificate of incorporation, as amended, restated bylaws and the Delaware General Corporation Law. For information on how to obtain copies of our restated certificate of incorporation, as amended, and restated bylaws, see &#8220;Where You Can Find More Information&#8221; on page 22 of this prospectus.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Common Stock </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The holders of common stock are entitled to one vote for each share held of record on all matters submitted to a vote of the stockholders and do not have cumulative voting rights. Accordingly, holders of a majority of the shares of common stock entitled to vote in any election of directors may elect all of the directors standing for election. Subject to preferences that may be applicable to any outstanding shares of preferred stock, the holders of common stock are entitled to receive ratably such dividends as may be declared by the board of directors out of funds legally available therefor. Upon the liquidation, dissolution or winding up of Lexicon, holders of our common stock are entitled to share ratably in all assets remaining after payment of liabilities and the liquidation preferences of any outstanding shares of preferred stock. Holders of common stock have no preemptive rights and no right to convert their common stock into any other securities. There are no redemption or sinking fund provisions applicable to our common stock. All outstanding shares of our common stock are, and all shares of common stock that may be issued under this prospectus will be, fully paid and non-assessable. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Preferred Stock </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Pursuant to our restated certificate of incorporation, our board of directors has the authority, without further action by the stockholders, to issue up to five million shares of preferred stock, in one or more series. Our board of directors is authorized to fix or alter from time to time the designation, powers, preferences and rights of the shares of each series of preferred stock, including dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences and sinking fund terms. Our board of directors may also establish from time to time the number of shares constituting any series of preferred stock, and to increase or decrease the number of shares of any series subsequent to the issuance of shares of that series, but not below the number of shares of any series then outstanding. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will fix the rights, preferences, privileges and restrictions of the preferred stock of each series in the certificate of designation relating to that series. We will incorporate by reference as an exhibit to the registration statement that includes this prospectus or as an exhibit to a report filed under the Exchange Act, the form of any certificate of designation that describes the terms of the series of preferred stock we are offering before the issuance of the related series of preferred stock. This description will include: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the title and stated value; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the number of shares we are offering; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the liquidation preference per share; </font></div></td></tr></table><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">4</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the purchase price; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the dividend rate, period and payment date and method of calculation for dividends; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">whether dividends will be cumulative or non-cumulative and, if cumulative, the date from which dividends will accumulate; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the provisions for a sinking fund, if any; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the provisions for redemption or repurchase, if applicable, and any restrictions on our ability to exercise those redemption and repurchase rights; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">whether the preferred stock will be convertible into our common stock, and, if applicable, the conversion price, or how it will be calculated, and the conversion period; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">whether the preferred stock will be exchangeable into debt securities, and, if applicable, the exchange price, or how it will be calculated, and the exchange period; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">voting rights, if any, of the preferred stock; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">preemption rights, if any; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">restrictions on transfer, sale or other assignment, if any; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the relative ranking and preferences of the preferred stock as to dividend rights and rights if we liquidate, dissolve or wind up our affairs; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any limitations on issuance of any class or series of preferred stock ranking senior to or on a parity with the series of preferred stock as to dividend rights and rights if we liquidate, dissolve or wind up our affairs; and </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any other specific terms, preferences, rights or limitations of, or restrictions on, the preferred stock. </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If we issue shares of preferred stock under this prospectus, the shares will be fully paid and non-assessable and will not have, or be subject to, any preemptive or similar rights. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Delaware General Corporation Law provides that the holders of preferred stock will have the right to vote separately as a class on any proposal involving fundamental changes in the rights of holders of that preferred stock. This right is in addition to any voting rights that may be provided for in the applicable certificate of designation. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The issuance of preferred stock could adversely affect the voting power, conversion or other rights of holders of common stock. Preferred stock could be issued quickly with terms designed to delay or prevent a change in control of our company or make removal of management more difficult. Additionally, the issuance of preferred stock may have the effect of decreasing the market price of our common stock. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Arrangements with Invus, L.P. and Its Affiliates</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In June 2007, we entered into a securities purchase agreement with Invus, L.P., under which Invus, L.P. made an initial investment of approximately $205.5 million to purchase 50,824,986 shares of our common stock in August 2007.  Under the securities purchase agreement, as amended and supplemented (the "securities purchase agreement"), and after accounting for the $181.5 million in net proceeds from our public offering and concurrent private placement of common stock in March 2010, Invus, L.P. and its affiliate Invus C.V., which we collectively refer to as Invus, have the right to require us to initiate a pro rata rights offering to our stockholders providing all stockholders with non-transferable rights to acquire shares of our common stock in an aggregate amount of up to approximately $163.0 million.  Invus may exercise its right to require us to conduct such a rights offering by giving us notice within a period of one year beginning on February 28, 2011, which will be extended by the number of days during such period that Invus is not permitted under the securities purchase agreement to initiate the rights offering as a result of any &#8220;blackout period&#8221; in connection with certain public offerings of our common stock.  If Invus elects to exercise its right to require us to initiate a rights offering, Invus would be required to purchase its pro rata portion of the offering, subject to certain customary closing conditions, including (1) the expiration or termination of any applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, (2) the accuracy (subject to materiality and material adverse effect qualifications) of our representations and warranties and our compliance in all material respects with the covenants to be performed by us in the securities purchase agreement and related ancillary agreements as of the closing of the rights offering and (3) the delivery of an officer's certificate certifying as to the satisfaction of the closing conditions set forth in clause (2) above, an opinion of counsel reasonably satisfactory to Invus (as specified in the securities purchase agreement) and certain certificates of good standing.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Under</font><font style="font-family:inherit;font-size:10pt;"> the securities purchase agreement, until the later of the completion of the rights offering or the expiration of the period during which Invus may require us to initiate the rights offering, we have agreed not to issue any of our common stock </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">5</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">for a per share price of less than $4.50 without the prior written consent of Invus, except pursuant to an employee or director stock option, incentive compensation or similar plan or to persons involved in the pharmaceutical industry in connection with simultaneous strategic transactions involving such persons in the ordinary course.  In addition, if we notify Invus of a proposed public offering for an offering above $4.50 per share during the period in which Invus may require us to initiate the rights offering, Invus will have a period of 10 business days in which to exercise its right to require us to conduct the rights offering, in which case we would be required to forego the proposed public offering and proceed with the rights offering.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Board of Directors</font><font style="font-family:inherit;font-size:10pt;">.  Concurrently with the execution of the securities purchase agreement, we entered into a stockholders' agreement with Invus, L.P. under which Invus has the right to designate the greater of three members or 30% (or the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates, if less than 30%) of all members of our board of directors, rounded up to the nearest whole number of directors, and pursuant to which Invus has designated Philippe J. Amouyal, Raymond Debbane and Christopher J. Sobecki.  Mr. Debbane is president and chief executive officer of The Invus Group, LLC, an affiliate of Invus, and Mr. Amouyal and Mr. Sobecki are each managing directors of The Invus Group, LLC.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In the event that the number of shares of our common stock owned by Invus and its affiliates ever exceeds 50% of the total number of shares of our common stock then outstanding (not counting for such purpose any shares acquired by Invus from third parties after June 17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement), from and after that time, Invus will have the right to designate a number of directors equal to the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates, rounded up to the nearest whole number of directors.  The directors appointed by Invus have proportionate representation on the compensation committee and corporate governance committee of our board of directors.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Invus' rights with respect to the designation of members of our board of directors and its compensation and corporate governance committees will terminate if the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%.  Invus will also have the right to terminate these provisions at any time following the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus and its affiliates from third parties after June 17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the standstill provisions of the stockholders' agreement).</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Preemptive Rights</font><font style="font-family:inherit;font-size:10pt;">.  Invus has preemptive rights under the stockholders' agreement to participate in future equity issuances by us (including any qualified offering), subject to certain exceptions, so as to maintain its then-current percentage ownership of our capital stock.  Subject to certain limitations, Invus will be required to exercise its preemptive rights in advance with respect to certain marketed offerings, in which case it will be obligated to buy its pro rata share of the number of shares being offered in such marketed offering, including any overallotment (or such lesser amount specified in its exercise of such rights), so long as the sale of the shares were priced within a range within 10% above or below the market price on the date we notified Invus of the offering and we met certain other conditions. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to preemptive rights will terminate on the earlier to occur of August&#160;28, 2017 and the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Standstill Provisions</font><font style="font-family:inherit;font-size:10pt;">.  Invus is subject to standstill provisions restricting its ability to purchase or otherwise acquire additional shares of common stock from third parties to an amount that would result in its ownership of our common stock not exceeding 49% of the total number of shares outstanding.  These standstill provisions will not apply to the acquisitions of securities by way of stock splits, stock dividends, reclassifications, recapitalizations, or other distributions by us, acquisitions contemplated by the securities purchase agreement and the stockholders' agreement, including in the rights offering and upon Invus' exercise of preemptive rights under the stockholders' agreement.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Except for acquisitions pursuant to the provisions described above, and subject to certain exceptions, Invus has agreed that it will not, and will cause its affiliates not to, without the approval of our unaffiliated board, directly or indirectly:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">solicit proxies to vote any of our voting securities or any voting securities of our subsidiaries;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">submit to our board of directors a written proposal for any merger, recapitalization, reorganization, business combination or other extraordinary transaction involving an acquisition of us or any of our subsidiaries or any of our or our subsidiaries' securities or assets by Invus and its affiliates;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">enter into discussions, negotiations, arrangements or understandings with any third party with respect to any of the foregoing; or</font></div></td></tr></table><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">6</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">request us or any of our representatives, directly or indirectly, to amend or waive any of these standstill provisions.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The standstill provisions of the stockholders' agreement will terminate on the earliest to occur of (a) August 28, 2017, (b) the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%, (c) the date on which the percentage of all of the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus from third parties after June 17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement), (d) the date on which any third party makes a public proposal to acquire (by purchase, exchange, merger or otherwise) assets or business constituting 50% or more of our revenues, net income or assets or 50% of any class of our equity securities or our board of directors recommends or approves, or proposes to recommend or approve, any such transaction or (e) the date on which any third party acquires beneficial ownership (by purchase, exchange, merger or otherwise) of assets or business constituting 20% or more of our revenues, net income or assets or 20% of any class of our equity securities or our board of directors recommends or approves, or proposes to recommend or approve, any such transaction. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Sales to Third Parties</font><font style="font-family:inherit;font-size:10pt;">.  Subject to certain exceptions, Invus has agreed that neither it nor its affiliates will sell any shares of common stock to third parties that are not affiliated with Invus if, to Invus' knowledge, such transfer  would result in any such third party (or any person or group including such third party) owning more than 14.9% of the total number of outstanding shares of our common stock. </font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to sales to third parties will terminate on the earliest to occur of (a)&#160;August 28, 2017, (b)&#160;the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates falls below 10%, and (c)&#160;the date on which the percentage of all the outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus and its affiliates from third parties after June 17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the standstill provisions of the stockholders' agreement).</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Voting of Shares</font><font style="font-family:inherit;font-size:10pt;">.  In any election of persons to serve on our board of directors, Invus will be obligated to vote all of the shares of common stock held by it and its affiliates in favor of the directors nominated by our board of directors, as long as we have complied with our obligation with respect to the designation of members of our board of directors described above and the individuals designated by Invus for election to our board of directors have been nominated, and, if applicable, are serving on our board of directors.  With respect to all other matters submitted to a vote of the holders of our common stock, Invus will be obligated to vote any shares that it acquired from third parties after June 17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of common stock, as permitted by the standstill provisions of the stockholders' agreement, in the same proportion as all the votes cast by other holders of our common stock, unless Invus and we (acting with the approval of the unaffiliated board) agree otherwise.  Invus may vote all other shares of our common stock held by it in its sole discretion.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to voting will terminate on the earliest to occur of (a)&#160;August&#160;28, 2017, (b)&#160;the date on which the percentage of all the outstanding shares of our common stock held by Invus and its affiliates falls below 10%, (c)&#160;the date on which the percentage of all outstanding shares of our common stock owned by Invus and its affiliates exceeds 50% (not counting for such purpose any shares acquired by Invus from third parties after June&#160;17, 2007 in excess of 40% (or, if higher, its then pro rata amount) of the total number of outstanding shares of our common stock, as permitted by the provisions of the stockholders' agreement), and (d)&#160;the termination of the standstill provisions in accordance with the stockholders' agreement.</font></div><div style="line-height:120%;padding-bottom:12px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Minority Protections</font><font style="font-family:inherit;font-size:10pt;">.  Invus is entitled to certain minority protections, including consent rights over (a) the creation or issuance of any new class or series of shares of our capital stock (or securities convertible into or exercisable for shares of our capital stock) having rights, preferences or privileges senior to or on parity with our common stock, (b) any amendment to our certificate of incorporation or bylaws, or amendment to the certificate of incorporation or bylaws of any of our subsidiaries, in a manner adversely affecting Invus' rights under the securities purchase agreement and the related agreements, (c) the repurchase, retirement, redemption or other acquisition of our or our subsidiaries' capital stock (or securities convertible into or exercisable for shares of our or our subsidiaries' capital stock), (d) any increase in the size of our board of directors to more than 12 members and (e) the adoption or proposed adoption of any stockholders' rights plan, &#8220;poison pill&#8221; or other similar plan or agreement, unless Invus is exempt from the provisions of such plan or agreement. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions of the stockholders' agreement relating to minority protections will terminate on the earlier to occur of August 28, 2017 and the date on which Invus and its affiliates hold less than 15% of the total number of outstanding shares of our common stock.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">7</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Registration Rights</font><font style="font-family:inherit;font-size:10pt;">.  Concurrently with the execution of the securities purchase agreement, we entered into a registration rights agreement with Invus, L.P., pursuant to which Invus, L.P. and its affiliates have certain demand and piggyback registration rights with respect to shares of our common stock held by them.  Invus, L.P. and its affiliates which hold our common stock have waived these registration rights with respect to any offerings of our securities pursuant to this prospectus.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Anti-Takeover Effects of Provisions of Delaware Law and Our Charter Documents </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Delaware Takeover Statute</font><font style="font-family:inherit;font-size:10pt;">. We are subject to the provisions of Section 203 of the Delaware General Corporation Law.  In general, the statute prohibits a publicly-held Delaware corporation such as Lexicon from engaging in a business combination with an interested stockholder for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner.  For purposes of Section 203, a business combination includes a merger, asset sale or other transaction resulting in a financial benefit to the interested stockholder.  An interested stockholder is a person who, together with affiliates and associates, owns (or within three years prior, did own) 15% or more of our voting stock. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;">Charter Documents</font><font style="font-family:inherit;font-size:10pt;">. Our restated certificate of incorporation, as amended, requires that any action required or permitted to be taken by our stockholders must be effected at a duly called annual or special meeting of stockholders and may not be effected by a consent in writing. Additionally, our restated certificate of incorporation, as amended: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">does not provide for the use of cumulative voting in the election of directors; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">provides for a board of directors, classified into three classes of directors; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">provides that the authorized number of directors may be changed only by resolution of our board of directors; and </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">provides for the authority of our board of directors to issue up to five million shares of &#8220;blank check&#8221; preferred stock and to determine the price, powers, preferences and rights of these shares, without stockholder approval. </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our restated bylaws provide that candidates for director may be nominated only by our board of directors or by a stockholder who gives written notice to us not less than 120 days nor more than 150 days in advance of the first anniversary of the date of our proxy statement relating to the previous year's annual meeting of stockholders.  The authorized number of directors is fixed in accordance with our restated certificate of incorporation, as amended.  Our board of directors currently consists of nine members, divided into three classes.  As a result, a portion of the board of directors will be elected each year.  The board of directors may appoint new directors to fill vacancies or newly created directorships.  Our restated bylaws also limit who may call a special meeting of stockholders. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Delaware law and these charter provisions may have the effect of deterring hostile takeovers or delaying changes in control of our management, which could depress the market price of our common stock. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Transfer Agent and Registrar </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The transfer agent and registrar for our common stock is BNY Mellon Shareowner Services.  The transfer agent for any series of preferred stock will be named and described in the prospectus supplement for that series. </font></div><a name="s9131D7EED20C8E27DC43B7DDDAAA581A"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">DESCRIPTION OF DEBT SECURITIES</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following description, together with the additional information we may include in any applicable prospectus supplements, summarizes the material terms and provisions of the debt securities that we may offer under this prospectus and the related indenture.  While the terms summarized below will apply generally to any debt securities we may offer under this prospectus, we will describe the particular terms of any debt securities that we may offer in more detail in the applicable prospectus supplement.  If we indicate in the prospectus supplement, the terms of any debt securities offered under that prospectus supplement may differ from the terms described below.  However, no prospectus supplement shall fundamentally change the terms that are set forth in this prospectus or offer a security that is not registered and described in this prospectus at the time of its effectiveness.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may offer debt securities in the form of either senior debt securities or subordinated debt securities.  Unless otherwise specified in a supplement to this prospectus, the debt securities will be our direct, unsecured obligations and will rank equally with all of our other unsecured and unsubordinated indebtedness.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The debt securities will be issued under an indenture between us and a trustee.  The following summary of the general features of the debt securities to be governed by the indenture is subject to, and qualified in its entirety by reference to, the provisions of the indenture applicable to a particular series of debt securities.  We have filed a form of indenture as an exhibit to the registration statement which includes this prospectus.  Capitalized terms used in the summary have the meanings specified in the indenture. </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">8</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">General </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The terms of each series of debt securities will be established by or pursuant to a resolution of our board of directors, or a committee thereof, and set forth or determined in the manner provided in an officer's certificate or by a supplemental indenture. The particular terms of each series of debt securities will be described in a prospectus supplement relating to such series, including any pricing supplement. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We can issue an unlimited amount of debt securities under the indenture that may be in one or more series with the same or various maturities, at par, at a premium or at a discount. We will set forth in a prospectus supplement, including any pricing supplement, relating to any series of debt securities being offered, the aggregate principal amount and the following terms of the debt securities: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:100%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:100%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the title of the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the price or prices (expressed as a percentage of the principal amount) at which we will sell the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any limit on the aggregate principal amount of the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the date or dates on which we will pay the principal on the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the rate or rates (which may be fixed or variable) per annum or the method used to determine the rate or rates (including any commodity, commodity index, stock exchange index or financial index) at which the debt securities will bear interest, the date or dates from which interest will accrue, the date or dates on which interest will commence and be payable and any regular record date for the interest payable on any interest payment date; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the place or places where principal of, and premium and interest on, the debt securities will be payable; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the terms and conditions upon which we may redeem the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any obligation we have to redeem or purchase the debt securities pursuant to any sinking fund or analogous provisions or at the option of a holder of debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the dates on which and the price or prices at which we will repurchase debt securities at the option of the holders of debt securities and other detailed terms and provisions of these repurchase obligations; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the denominations in which the debt securities will be issued, if other than denominations of $1,000 and any integral multiple thereof; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">whether the debt securities will be issued in the form of certificated debt securities or global debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the portion of principal amount of the debt securities payable upon declaration of acceleration of the maturity date, if other than the principal amount; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the currency of denomination of the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the designation of the currency, currencies or currency units in which payment of principal of, and premium and interest on, the debt securities will be made; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if payments of principal of, or premium or interest on, the debt securities will be made in one or more currencies or currency units other than that or those in which the debt securities are denominated, the manner in which the exchange rate with respect to these payments will be determined; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the manner in which the amounts of payment of principal of, or premium or interest on, the debt securities will be determined, if these amounts may be determined by reference to an index based on a currency or currencies other than that in which the debt securities are denominated or designated to be payable or by reference to a commodity, commodity index, stock exchange index or financial index; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any provisions relating to any security provided for the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any addition to or change in the events of default described in this prospectus or in the indenture with respect to the debt securities and any change in the acceleration provisions described in this prospectus or in the indenture with respect to the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any addition to or change in the covenants described in this prospectus or in the indenture with respect to the debt securities; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any conversion provisions, including the conversion price, the conversion period, provisions as to whether conversion will be mandatory, at the option of the holder or at our option, the events requiring an adjustment of the conversion price and provisions affecting conversion if such series of debt securities are redeemed; </font></div></td></tr></table><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">9</font></div></div><hr style="page-break-after:always"><a name="s38EB0A25CFCAE1FE6D04B7D55A517FD6"></a><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">DESCRIPTION OF WARRANTS</font></div><div style="line-height:120%;padding-bottom:9px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following description, together with the additional information we may include in any applicable prospectus supplements, summarizes the material terms and provisions of the warrants that we may offer under this prospectus and the related warrant agreements and warrant certificates. While the terms summarized below will apply generally to any warrants that we may offer under this prospectus, we will describe the particular terms of any series of warrants that we may offer in more detail in the applicable prospectus supplement. If we indicate in the prospectus supplement, the terms of any warrants offered under that prospectus supplement may differ from the terms described below. However, no prospectus supplement shall fundamentally change the terms that are set forth in this prospectus or offer a security that is not registered and described in this prospectus at the time of its effectiveness. Specific warrant agreements will contain additional important terms and provisions and will be incorporated by reference as an exhibit to the registration statement that includes this prospectus or as an exhibit to a report filed under the Exchange Act. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">General </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will describe in the applicable prospectus supplement the terms of the series of warrants, including: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the offering price and aggregate number of warrants offered;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the currency for which the warrants may be purchased;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if applicable, the designation and terms of the securities with which the warrants are issued and the number of warrants issued with each such security or each principal amount of such security;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if applicable, the date on and after which the warrants and the related securities will be separately transferable;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">in the case of warrants to purchase common stock or preferred stock, the number of shares of common stock or preferred stock, as the case may be, purchasable upon the exercise of one warrant and the price at which these shares may be purchased upon such exercise;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">in the case of warrants to purchase debt securities, the principal amount of debt securities purchasable upon exercise of one warrant and the price at, and currency in which, this principal amount of debt securities may be purchased upon such exercise;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the effect of any merger, consolidation, sale or other disposition of our business on the warrant agreements and the warrants;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the terms of any rights to redeem or call the warrants;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any provisions for changes to or adjustments in the exercise price or number of securities issuable upon exercise of the warrants;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the dates on which the right to exercise the warrants will commence and expire;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the manner in which the warrant agreements and warrants may be modified;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">federal income tax consequences of holding or exercising the warrants;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the terms of the securities issuable upon exercise of the warrants; and  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any other specific terms, preferences, rights or limitations of or restrictions on the warrants.  </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Before exercising their warrants, holders of warrants will not have any of the rights of holders of the securities purchasable upon such exercise, including: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">in the case of warrants to purchase common stock or preferred stock, the right to receive dividends, if any, or, payments upon our liquidation, dissolution or winding up or to exercise voting rights, if any; or</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">in the case of warrants to purchase debt securities, the right to receive payments of principal of, or premium, if any, or interest on, the debt securities purchasable upon exercise or to enforce covenants in the applicable indenture.</font></div></td></tr></table><div style="line-height:100%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Exercise of Warrants </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each warrant will entitle the holder to purchase the securities that we specify in the applicable prospectus supplement at the exercise price that we describe in the applicable prospectus supplement. Unless we otherwise specify in the applicable prospectus supplement, holders of the warrants may exercise the warrants at any time up to the specified time on the expiration date that we set forth in the applicable prospectus supplement. After the close of business on the expiration date, unexercised warrants will become void. </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">10</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Holders of the warrants may exercise the warrants by delivering the warrant certificate representing the warrants to be exercised together with specified information, and paying the required amount to the warrant agent in immediately available funds, as provided in the applicable prospectus supplement. We will set forth on the reverse side of the warrant certificate and in the applicable prospectus supplement the information that the holder of the warrant will be required to deliver to the warrant agent. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Upon receipt of the required payment and the warrant certificate properly completed and duly executed at the corporate trust office of the warrant agent or any other office indicated in the applicable prospectus supplement, we will issue and deliver the securities purchasable upon such exercise. If fewer than all of the warrants represented by the warrant certificate are exercised, then we will issue a new warrant certificate for the remaining amount of warrants. If we so indicate in the applicable prospectus supplement, holders of the warrants may surrender securities as all or part of the exercise price for warrants. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Governing Law </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The warrants and warrant agreements will be governed by and construed in accordance with the laws of the State of New York. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Enforceability of Rights by Holders of Warrants </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each warrant agent will act solely as our agent under the applicable warrant agreement and will not assume any obligation or relationship of agency or trust with any holder of any warrant. A single bank or trust company may act as warrant agent for more than one issue of warrants. A warrant agent will have no duty or responsibility in case of any default by us under the applicable warrant agreement or warrant, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand upon us. Any holder of a warrant may, without the consent of the related warrant agent or the holder of any other warrant, enforce by appropriate legal action its right to exercise, and receive the securities purchasable upon exercise of, its warrants. </font></div><a name="sBF7ED4D7E15A3DD74775B7D57FF9263A"></a><div style="line-height:120%;padding-bottom:9px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">DESCRIPTION OF RIGHTS</font></div><div style="line-height:120%;padding-bottom:9px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following description, together with the additional information we may include in any applicable prospectus supplements, summarizes the material terms and provisions of the rights that we may offer under this prospectus and the related rights agreements (including, without limitation, rights offered in a rights offering conducted pursuant to Invus' right to require us to initiate a rights offering). While the terms summarized below will apply generally to any rights that we may offer under this prospectus, we will describe the particular terms of any series of rights that we may offer in more detail in the applicable prospectus supplement. If we indicate in the prospectus supplement, the terms of any rights offered under that prospectus supplement may differ from the terms described below. However, no prospectus supplement shall fundamentally change the terms that are set forth in this prospectus or offer a security that is not registered and described in this prospectus at the time of its effectiveness. Specific rights agreements will contain additional important terms and provisions and will be incorporated by reference as an exhibit to the registration statement that includes this prospectus or as an exhibit to a report filed under the Exchange Act.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">General</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may issue rights to purchase common stock, preferred stock, debt securities or other securities. These rights may be issued independently or together with any other security offered hereby and may or may not be transferable by the stockholder receiving the rights in such offering. In connection with any offering of such rights, we may enter into a standby arrangement with one or more underwriters or other purchasers pursuant to which the underwriters or other purchasers may be required to purchase any securities remaining unsubscribed for after such offering.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each series of rights will be issued under a separate rights agreement or other arrangements that we will enter into with a bank or trust company, as rights agent, all as set forth in the applicable prospectus supplement. The rights agent will act solely as our agent in connection with the certificates relating to the rights and will not assume any obligation or relationship of agency or trust with any holders of rights certificates or beneficial owners of rights. We will file any rights agreement and the rights certificates relating to each series of rights with the SEC, and incorporate them by reference as an exhibit to the registration statement of which this prospectus is a part on or before the time we issue a series of rights. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will describe in the applicable prospectus supplement the terms of the series of rights, including:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the date of determining the stockholders entitled to the rights distribution;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the number of rights issued or to be issued to each stockholder;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the exercise price payable for each share of common stock, preferred stock, debt securities or other securities upon the exercise of the rights;</font></div></td></tr></table><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">11</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the number and terms of the shares of common stock, preferred stock, debt securities or other securities which may be purchased per each right;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the extent to which the rights are transferable, if at all;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the date on which the holder's ability to exercise the rights shall commence, and the date on which the rights shall expire;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the extent to which the rights may include an over-subscription privilege with respect to unsubscribed securities;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if applicable, the material terms of any standby underwriting or purchase arrangement entered into by us in connection with the offering of such rights; and  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:10px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any other terms of the rights, including the terms, procedures, conditions and limitations relating to the exchange and exercise of the rights. </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:32px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The description in the applicable prospectus supplement of any rights that we may offer will not necessarily be complete and will be qualified in its entirety by reference to the applicable rights certificate, which will be filed with the SEC. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Exercise of Rights</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each right will entitle the holder of the right to purchase for cash such amount of shares of common stock, preferred stock, debt securities or other securities at such exercise price as shall in each case be set forth in, or be determinable as set forth in, the prospectus supplement relating to the rights offered thereby. Rights may be exercised at any time up to the close of business on the expiration date for such rights set forth in the prospectus supplement. After the close of business on the expiration date, all unexercised rights will become void.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Rights may be exercised as set forth in the prospectus supplement relating to the rights offered thereby. Upon receipt of payment and the rights certificate properly completed and duly executed at the corporate trust office of the rights agent or any other office indicated in the prospectus supplement, we will forward, as soon as practicable, the shares of common stock, preferred stock, debt securities or other securities purchasable upon such exercise. We may determine to offer any unsubscribed offered securities directly to persons other than stockholders, to or through agents, underwriters or dealers or through a combination of such methods, including pursuant to standby underwriting arrangements, as set forth in the applicable prospectus supplement. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Governing Law</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The rights and rights agreements will be governed by and construed in accordance with the laws of the State of New York.</font></div><a name="s3B8C9E2F3411BD4A09E3B7D5A7BC4457"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">DESCRIPTION OF UNITS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The following description, together with the additional information we may include in any applicable prospectus supplements, summarizes the material terms and provisions of the units that we may offer under this prospectus and the related unit agreements. While the terms summarized below will apply generally to any units that we may offer under this prospectus, we will describe the particular terms of any series of units that we may offer in more detail in the applicable prospectus supplement. If we indicate in the prospectus supplement, the terms of any units offered under that prospectus supplement may differ from the terms described below. However, no prospectus supplement shall fundamentally change the terms that are set forth in this prospectus or offer a security that is not registered and described in this prospectus at the time of its effectiveness. Specific unit agreements will contain additional important terms and provisions and will be incorporated by reference as an exhibit to the registration statement that includes this prospectus or as an exhibit to a report filed under the Exchange Act. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">General </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may issue units comprised of one or more shares of common stock, shares of preferred stock, debt securities and warrants in any combination. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations of a holder of each included security. The unit agreement under which a unit is issued may provide that the securities included in the unit may not be held or transferred separately, at any time or at any time before a specified date. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We will describe in the applicable prospectus supplement the terms of the series of units, including: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the designation and terms of the units and of the securities comprising the units, including whether and under what circumstances those securities may be held or transferred separately;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any provisions of the governing unit agreement that differ from those described below; and  </font></div></td></tr></table><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">12</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div></div><br><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">any provisions for the issuance, payment, settlement, transfer or exchange of the units or of the securities comprising the units.  </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The provisions described in this section, as well as those described under &#8220;Description of Capital Stock,&#8221; &#8220;Description of Debt Securities&#8221; and &#8220;Description of Warrants&#8221; will apply to each unit and to any common stock, preferred stock, debt security or warrant included in each unit, respectively. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Issuance in Series </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may issue units in such amounts and in numerous distinct series as we determine. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Enforceability of Rights by Holders of Units </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each unit agent will act solely as our agent under the applicable unit agreement and will not assume any obligation or relationship of agency or trust with any holder of any unit. A single bank or trust company may act as unit agent for more than one series of units. A unit agent will have no duty or responsibility in case of any default by us under the applicable unit agreement or unit, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand upon us. Any holder of a unit may, without the consent of the related unit agent or the holder of any other unit, enforce by appropriate legal action its rights as holder under any security included in the unit. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Title </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Lexicon, the unit agents and any of their agents may treat the registered holder of any unit certificate as an absolute owner of the units evidenced by that certificate for any purpose and as the person entitled to exercise the rights attaching to the units so requested, despite any notice to the contrary. See &#8220;Legal Ownership of Securities.&#8221; </font></div><a name="s05E391489B300328DA53B7D5C568D4FD"></a><div style="line-height:120%;padding-bottom:10px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">LEGAL OWNERSHIP OF SECURITIES</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We can issue securities in registered form or in the form of one or more global securities. We describe global securities in greater detail below. We refer to those persons who have securities registered in their own names on the books that we or any applicable trustee maintain for this purpose as the &#8220;holders&#8221; of those securities. These persons are the legal holders of the securities. We refer to those persons who, indirectly through others, own beneficial interests in securities that are not registered in their own names, as &#8220;indirect holders&#8221; of those securities. As we discuss below, indirect holders are not legal holders, and investors in securities issued in book-entry form or in street name will be indirect holders. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Book-Entry Holders </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may issue securities in book-entry form only, as we will specify in the applicable prospectus supplement. This means securities may be represented by one or more global securities registered in the name of a financial institution that holds them as depositary on behalf of other financial institutions that participate in the depositary's book-entry system. These participating institutions, which are referred to as participants, in turn, hold beneficial interests in the securities on behalf of themselves or their customers. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Only the person in whose name a security is registered is recognized as the holder of that security. Securities issued in global form will be registered in the name of the depositary or its nominee. Consequently, for securities issued in global form, we will recognize only the depositary as the holder of the securities, and we will make all payments on the securities to the depositary. The depositary passes along the payments it receives to its participants, which in turn pass the payments along to their customers who are the beneficial owners. The depositary and its participants do so under agreements they have made with one another or with their customers; they are not obligated to do so under the terms of the securities. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As a result, investors in a book-entry security will not own securities directly. Instead, they will own beneficial interests in a global security, through a bank, broker or other financial institution that participates in the depositary's book-entry system or holds an interest through a participant. As long as the securities are issued in global form, investors will be indirect holders, and not holders, of the securities. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Street Name Holders </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may terminate a global security or issue securities in non-global form. In these cases, investors may choose to hold their securities in their own names or in &#8220;street name.&#8221; Securities held by an investor in street name would be registered in the name of a bank, broker or other financial institution that the investor chooses, and the investor would hold only a beneficial interest in those securities through an account he or she maintains at that institution. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For securities held in street name, we will recognize only the intermediary banks, brokers and other financial institutions in whose names the securities are registered as the holders of those securities, and we will make all payments on those securities </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">13</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">to them. These institutions pass along the payments they receive to their customers who are the beneficial owners, but only because they agree to do so in their customer agreements or because they are legally required to do so. Investors who hold securities in street name will be indirect holders, not holders, of those securities. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Legal Holders </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our obligations, as well as the obligations of any applicable trustee and of any third parties employed by us or a trustee, run only to the legal holders of the securities. We do not have obligations to investors who hold beneficial interests in global securities, in street name or by any other indirect means. This will be the case whether an investor chooses to be an indirect holder of a security or has no choice because we are issuing the securities only in global form. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For example, once we make a payment or give a notice to the holder, we have no further responsibility for the payment or notice even if that holder is required, under agreements with depositary participants or customers or by law, to pass it along to the indirect holders but does not do so. Similarly, we may want to obtain the approval of the holders to amend an indenture, to relieve us of the consequences of a default or of our obligation to comply with a particular provision of the indenture or for other purposes. In such an event, we would seek approval only from the holders, and not the indirect holders, of the securities. Whether and how the holders contact the indirect holders is up to the holders. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Special Considerations for Indirect Holders </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If you hold securities through a bank, broker or other financial institution, either in book-entry form or in street name, you should check with your own institution to find out: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">how it handles securities payments and notices;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">whether it imposes fees or charges;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">how it would handle a request for the holders' consent, if ever required;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">whether and how you can instruct it to send you securities registered in your own name so you can be a holder, if that is permitted in the future;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">how it would exercise rights under the securities if there were a default or other event triggering the need for holders to act to protect their interests; and  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:8px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if the securities are in book-entry form, how the depositary's rules and procedures will affect these matters.  </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Global Securities </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">A global security is a security that represents one or any other number of individual securities held by a depositary. Generally, all securities represented by the same global securities will have the same terms. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Each security issued in book-entry form will be represented by a global security that we deposit with and register in the name of a financial institution or its nominee that we select. The financial institution that we select for this purpose is called the depositary. Unless we specify otherwise in the applicable prospectus supplement, The Depository Trust Company, New York, New York, known as DTC, will be the depositary for all securities issued in book-entry form. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">A global security may not be transferred to or registered in the name of anyone other than the depositary, its nominee or a successor depositary, unless special termination situations arise. We describe those situations below under &#8220;Special Situations When a Global Security Will Be Terminated.&#8221; As a result of these arrangements, the depositary, or its nominee, will be the sole registered owner and holder of all securities represented by a global security, and investors will be permitted to own only beneficial interests in a global security. Beneficial interests must be held by means of an account with a broker, bank or other financial institution that in turn has an account with the depositary or with another institution that does. Thus, an investor whose security is represented by a global security will not be a holder of the security, but only an indirect holder of a beneficial interest in the global security. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If the prospectus supplement for a particular security indicates that the security will be issued in global form only, then the security will be represented by a global security at all times unless and until the global security is terminated. If termination occurs, we may issue the securities through another book-entry clearing system or decide that the securities may no longer be held through any book-entry clearing system. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Special Considerations for Global Securities </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">As an indirect holder, an investor's rights relating to a global security will be governed by the account rules of the investor's financial institution and of the depositary, as well as general laws relating to securities transfers. We do not recognize an indirect holder as a holder of securities and instead deal only with the depositary that holds the global security. </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">14</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If securities are issued only in the form of a global security, an investor should be aware of the following: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">An investor cannot cause the securities to be registered in his or her name, and cannot obtain non-global certificates for his or her interest in the securities, except in the special situations we describe below;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">An investor will be an indirect holder and must look to his or her own bank or broker for payments on the securities and protection of his or her legal rights relating to the securities, as we describe above;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">An investor may not be able to sell interests in the securities to some insurance companies and to other institutions that are required by law to own their securities in non-book-entry form;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">An investor may not be able to pledge his or her interest in a global security in circumstances where certificates representing the securities must be delivered to the lender or other beneficiary of the pledge in order for the pledge to be effective;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The depositary's policies, which may change from time to time, will govern payments, transfers, exchanges and other matters relating to an investor's interest in a global security. We and any applicable trustee have no responsibility for any aspect of the depositary's actions or for its records of ownership interests in a global security. We and the trustee also do not supervise the depositary in any way;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The depositary may, and we understand that DTC will, require that those who purchase and sell interests in a global security within its book-entry system use immediately available funds, and your broker or bank may require you to do so as well; and  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Financial institutions that participate in the depositary's book-entry system, and through which an investor holds its interest in a global security, may also have their own policies affecting payments, notices and other matters relating to the securities. There may be more than one financial intermediary in the chain of ownership for an investor. We do not monitor and are not responsible for the actions of any of those intermediaries.  </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">Special Situations When a Global Security Will Be Terminated </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In a few special situations described below, the global security will terminate and interests in it will be exchanged for physical certificates representing those interests. After that exchange, the choice of whether to hold securities directly or in street name will be up to the investor. Investors must consult their own banks or brokers to find out how to have their interests in securities transferred to their own name, so that they will be direct holders. We have described the rights of holders and street name investors above. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The global security will terminate when the following special situations occur: </font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if the depositary notifies us that it is unwilling, unable or no longer qualified to continue as depositary for that global security and we do not appoint another institution to act as depositary within 90 days;  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if we notify any applicable trustee that we wish to terminate that global security; or  </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">if an event of default has occurred with regard to securities represented by that global security and has not been cured or waived.  </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The prospectus supplement may also list additional situations for terminating a global security that would apply only to the particular series of securities covered by the prospectus supplement. When a global security terminates, the depositary, and not we or any applicable trustee, is responsible for deciding the names of the institutions that will be the initial direct holders. </font></div><a name="s8FB9081BAAAAAF3CA839B7D5E9687E1A"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">This prospectus and the documents incorporated by reference into this prospectus contain certain information regarding our financial projections, plans and strategies that are forward-looking statements within the meaning of Section 27A of the Securities Act and 21E of the Exchange Act.  We have attempted to identify forward-looking statements by terminology including &#8220;anticipate,&#8221; &#8220;believe,&#8221; &#8220;can,&#8221; &#8220;continue,&#8221; &#8220;could,&#8221; &#8220;estimate,&#8221; &#8220;expect,&#8221; &#8220;intend,&#8221; &#8220;may,&#8221; &#8220;plan,&#8221; &#8220;potential,&#8221; &#8220;predict,&#8221; &#8220;should&#8221; or &#8220;will&#8221; or the negative of these terms or other comparable terminology.  These statements, which are only predictions and involve known and unknown risks, uncertainties and other important factors may include, among other things, statements which address our strategy and operating performance, events or developments that we expect or anticipate will occur in the future, such as projections of our future results of operations or of our financial condition, the status of any collaborative agreements or clinical trials, the expected timing of the completion of our ongoing and future clinical trials and the results of such trials, including top-line data, expected timing of initiation of our planned clinical trials, expected enrollment in our ongoing and future clinical trials, and our research and development efforts and anticipated trends in our business.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">15</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We have based these forward-looking statements on our current expectations and projections about future events.  However, there may be events in the future that we are not able to predict accurately or which we do not fully control that could cause actual results to differ materially from those expressed or implied in our forward-looking statements.  Many important factors could cause actual results to differ materially from those expressed or implied by these forward-looking statements, including those discussed under &#8220;Risk Factors&#8221; in this prospectus and any prospectus supplement and other sections of the documents incorporated by reference into this prospectus.  Except as required by applicable law, we undertake no obligation to publicly release any revisions to the forward-looking statements or reflect events or circumstances after the date of this prospectus.</font></div><a name="sD07F871ABA8A863A1A3EB7D61ED921C2"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">RATIO OF EARNINGS TO FIXED CHARGES</font></div><div style="line-height:120%;padding-bottom:4px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our earnings were insufficient to cover fixed charges in each of the years in the five-year period ended December&#160;31, 2010 and in the nine-month period ended September&#160;30, 2011.  &#8220;Fixed charges&#8221; consist of interest expense and the estimated interest included in rental expense.  The following table sets forth the computation of our ratio of earnings to fixed charges for the periods indicated:</font></div><div style="line-height:120%;text-align:center;font-size:10pt;"><div style="padding-left:0px;text-indent:0px;line-height:normal;padding-top:10px;"><table cellpadding="0" cellspacing="0" style="font-family:Times New Roman;font-size:10pt;margin-left:auto;margin-right:auto;width:90.8203125%;border-collapse:collapse;text-align:left;"><tr><td colspan="20"></td></tr><tr><td width="5%"></td><td width="6%"></td><td width="28%"></td><td width="15%"></td><td width="1%"></td><td width="3%"></td><td width="6%"></td><td width="1%"></td><td width="2%"></td><td width="5%"></td><td width="1%"></td><td width="2%"></td><td width="4%"></td><td width="1%"></td><td width="3%"></td><td width="7%"></td><td width="1%"></td><td width="2%"></td><td width="6%"></td><td width="1%"></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Nine months ended</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="14" style="vertical-align:bottom;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">Fiscal years ended December 31,</font></div></td></tr><tr><td colspan="3" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">September 30, 2011</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">2010</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">2009</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">2008</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:middle;border-bottom:1px solid #000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:center;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;font-weight:bold;">2007</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:middle;border-bottom:1px solid 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#000000;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td><td colspan="2" style="vertical-align:bottom;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="overflow:hidden;height:6px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">&#160;</font></div></td></tr><tr><td style="vertical-align:top;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">(1)</font></div></td><td colspan="19" style="vertical-align:middle;padding-left:2px;padding-top:2px;padding-bottom:2px;padding-right:2px;"><div style="text-align:left;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;">For the nine months ended September 30, 2011, and the fiscal years ended December&#160;31, 2010, 2009, 2008, 2007 and 2006, our earnings were insufficient to cover fixed charges by $82.4&#160;million, $101.8&#160;million, $82.9&#160;million, $76.9&#160;million, $58.8&#160;million and $54.4&#160;million, respectively.</font></div></td></tr></table></div></div><div style="line-height:120%;padding-bottom:10px;padding-top:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">For the periods indicated above, we had no outstanding shares of preferred stock with required dividend payments.  Therefore, our ratios of earnings to combined fixed charges and preferred stock dividends for the periods indicated are identical to the ratios presented in the table above.</font></div><a name="s7676C22867E2B7BBD5AEB7D69D4C43EB"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">USE OF PROCEEDS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Except as otherwise described in the prospectus supplement relating to an offering, we intend to use the net proceeds from the sale(s) of securities offered pursuant to this prospectus and any prospectus supplement for research and development and general corporate purposes, including capital expenditures and working capital needs.  We may also use some or all of the net proceeds to acquire or invest in businesses, products and technologies that are complementary to our own.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The amounts that we actually expend for working capital purposes, investments or acquisitions will vary significantly depending on a number of factors, including our future revenues, the amount of cash we generate from operations and the progress of our product development efforts.  Accordingly, our management will retain broad discretion in the allocation of the net proceeds from the sale(s) of the offered securities.  If we elect at the time of the issuance of the securities to make different or more specific use of proceeds other than as described in this prospectus, the change in use of proceeds will be described in the applicable prospectus supplement.</font></div><a name="sF583A813A84FB8E81D11B7D6B638EBF0"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">PLAN OF DISTRIBUTION</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may sell securities under this prospectus from time to time in any one or more of the following ways:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">to or through underwriters;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">through brokers or dealers;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">directly to other purchasers; or</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">through agents.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may sell securities under this prospectus from time to time in one or more transactions:</font></div><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">at a fixed price or prices, which may be changed;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">at market prices prevailing at the time of sale;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">at prices related to such prevailing market prices; or</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:9px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">at negotiated prices.  </font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The prospectus supplement relating to the securities will set forth the terms of the offering of such securities, including the name or names of any underwriters, brokers, dealers or agents, the name or names of any managing underwriter or </font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">16</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">underwriters, the purchase price of the securities and the net proceeds to us from such sale, any delayed delivery arrangements, any underwriting discounts and commissions and other items constituting underwriters' compensation, any public offering price, any discounts or concessions allowed or reallowed or paid to dealers, any commissions paid to agents and any securities exchange or market on which the securities may be listed.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If we use underwriters in the sale of securities, the underwriters will acquire the securities for their own account.  The underwriters may resell the securities from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale.  Underwriters may offer securities to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more firms acting as underwriters.  Unless we inform you otherwise in the prospectus supplement, the obligations of the underwriters to purchase the securities will be subject to certain conditions, and the underwriters will be obligated to purchase all of the offered securities if they purchase any of them.  The underwriters may change from time to time any public offering price and any discounts or concessions allowed or reallowed or paid to dealers.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">In connection with the sale of our securities, underwriters, brokers, dealers or agents may receive compensation from us or purchasers of securities for whom they may act as agents, in the form of discounts, concessions or commissions.  Underwriters, dealers and agents that participate in the distribution of our securities may be deemed to be underwriters, and any discounts or commissions received by them from us and any profit on the resale of securities by them may be deemed to be underwriting discounts and commissions under the Securities Act.  Any person who may be deemed to be an underwriter will be identified, and the compensation received from us will be described, in the prospectus supplement.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">During and after an offering through underwriters, the underwriters may purchase and sell the securities in the open market.  These transactions may include over-allotment and stabilizing transactions and purchases to cover syndicate short positions created in connection with the offering.  The underwriters may also impose a penalty bid, whereby selling concessions allowed to syndicate members or other broker-dealers for the securities sold for their account may be reclaimed by the syndicate if those securities are repurchased by the syndicate in stabilizing or covering transactions.  These activities may stabilize, maintain or otherwise affect the market price of the securities, which may be higher than the price that might otherwise prevail in the open market, and, if commenced, may be discontinued at any time.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If dealers or brokers acting as dealers are used in the sale of the securities, we will sell the securities to such dealers or brokers as principals.  The dealers or brokers acting as dealers may then resell such securities to the public at varying prices to be determined by such dealers or brokers at the time of resale.  The names of dealers or brokers acting as dealers and the terms of the transaction will be set forth in the prospectus supplement relating to such securities.  We may sell the securities directly or through agents designated by us from time to time.  Any agent involved in the offer or sale of the securities will be named, and any commissions that we pay to such agent will be set forth, in the prospectus supplement relating to such securities.  Unless otherwise indicated in the prospectus supplement, any such agent will be acting on a best efforts basis for the period of its appointment.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may sell securities directly, in which case no underwriters or agents would be involved.  We may sell securities directly to institutional investors or others who may be deemed to be underwriters within the meaning of the Securities Act with respect to any sale of those securities.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may offer securities through agents in connection with a distribution to our stockholders of rights to purchase such securities (including, without limitation, rights offered in a rights offering conducted pursuant to Invus' right to require us to initiate a rights offering).  The terms of any such sales will be described in the prospectus supplement relating thereto.  Pursuant to any standby underwriting agreement entered into in connection with a rights offering to our stockholders, persons acting as standby underwriters may receive a commitment fee for all securities underlying the rights that the underwriter commits to purchase on a standby basis.  Additionally, prior to the expiration date with respect to any rights, any standby underwriters in a rights offering to our stockholders may offer such securities on a when-issued basis, including securities to be acquired through the purchase and exercise of rights, at prices set from time to time by the standby underwriters.  After the expiration date with respect to such rights, the underwriters may offer securities of the type underlying the rights, whether acquired pursuant to a standby underwriting agreement, the exercise of the rights or the purchase of such securities in the market, to the public at a price or prices to be determined by the underwriters.  The standby underwriters may thus realize profits or losses independent of the underwriting discounts or commissions paid by us.  If we do not enter into a standby underwriting agreement in connection with a rights offering to our stockholders, we may elect to retain a dealer-manager to manage such a rights offering for us.  We also may enter into a standby arrangement with other purchasers pursuant to which such purchasers may be required to purchase any securities remaining unsubscribed for after such offering.  Any such dealer-manager may offer securities of the type underlying the rights acquired or to be acquired pursuant to the purchase and exercise of rights and may thus realize profits or losses independent of any dealer-manager fee paid by us.</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">17</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If Invus elects to exercise its right to require us to initiate a rights offering to our stockholders, Invus would be required to purchase its pro rata portion of the offering.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">All securities we offer, other than common stock and other securities issued upon a reopening of a previous series, will be new issues of securities with no established trading market.  Any underwriters may make a market in these securities, but will not be obligated to do so and may discontinue any market making at any time without notice.  We cannot guarantee the liquidity of the trading markets for any securities.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">If so indicated in the prospectus supplement, we will authorize agents, underwriters, brokers or dealers to solicit offers from certain types of institutions to purchase securities at the public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future.  Such contracts will be subject only to those conditions set forth in the prospectus supplement, and the prospectus supplement will set forth also the commission payable for solicitation of such contracts.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We may have agreements with the underwriters, dealers and agents to indemnify them against specific civil liabilities, including liabilities under the Securities Act, or to contribute with respect to payments which the underwriters, dealers or agents may be required to make as a result of those specific civil liabilities.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Underwriters and agents and their affiliates may be customers of, engage in transactions with, or perform services for us or our subsidiaries in the ordinary course of their businesses.</font></div><a name="s328ACEEF4486D8292135B7D7066E0BFA"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">LEGAL MATTERS</font></div><div style="line-height:120%;padding-bottom:8px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The validity of the issuance of the securities offered by this prospectus has been passed upon for us by Vinson&#160;&amp; Elkins L.L.P., Houston, Texas. </font></div><a name="s959B130BC5B299FF1ED3B7D7339B231C"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">EXPERTS</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Ernst &amp; Young LLP, independent registered public accounting firm, has audited our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2010, as set forth in their report, which is incorporated by reference in this prospectus and elsewhere in the registration statement.  Our financial statements are incorporated by reference in reliance on Ernst &amp; Young LLP's report, given on their authority as experts in accounting and auditing.</font></div><a name="s45AFCE0AF55FE061E866B7D767884215"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">WHERE YOU CAN FIND MORE INFORMATION</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">We file reports, proxy statements and other information with the SEC.  You may read and copy the reports, proxy statements and other information that we file with the SEC at the SEC's Public Reference Room at 100 F Street, NE, Washington, D.C. 20549.  Please call the SEC at 1-800-SEC-0330 for information about the operation of its Public Reference Room and for its prescribed rates to obtain copies of such material.  The SEC also maintains a website that contains reports, proxy and information statements and other information regarding registrants, like us, that file electronically with the SEC.  The address of the SEC's Internet site is </font><font style="font-family:inherit;font-size:10pt;color:#0000ff;text-decoration:underline;">http://www.sec.gov</font><font style="font-family:inherit;font-size:10pt;">.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and other filings with the SEC are available, free of charge, through our website, as soon as reasonably practicable after those reports or filings are electronically filed with or furnished to the SEC.  Information on our website or any other website is not incorporated by reference into this prospectus or any prospectus supplement and does not constitute a part of this prospectus or any prospectus supplement. </font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">This prospectus is part of a registration statement we filed with the SEC relating to the securities we may offer.  As permitted by SEC rules, this prospectus does not contain all of the information we have included in the registration statement and the accompanying exhibits and schedules we filed with the SEC.  You may refer to the registration statement, exhibits and schedules for more information about us and the securities.  The registration statements, exhibits and schedules are available at the SEC's public reference room or through its website. </font></div><a name="s4F4E773A4CB69D8C2349B7D7929F64DA"></a><div style="line-height:120%;padding-bottom:12px;padding-top:2px;text-align:center;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">DOCUMENTS INCORPORATED BY REFERENCE</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The SEC allows us to &#8220;incorporate by reference&#8221; the information we have filed with it, which means that we can disclose important information to you by referring you to those documents.  The information we incorporate by reference is an important part of this prospectus, and later information that we file with the SEC will automatically update and supersede this information.  We incorporate by reference the documents listed below that we have previously filed with the SEC and any future documents filed with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to the date of this prospectus and prior to the termination of the offering of the securities covered by this prospectus:</font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">18</font></div></div><hr style="page-break-after:always"><div><div style="line-height:120%;font-size:10pt;"><a style="text-decoration:underline;color:#0000FF;" href="#sFABB0FF146405D11A61AC721A461EA33"><font style="font-family:inherit;font-size:10pt;">Table of Contents</font></a></div></div><br><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">our annual report on Form 10-K for the year ended December 31, 2010;</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">our quarterly reports on Form 10-Q for the quarterly periods ended March 31, June 30 and September 30, 2011; </font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">our current reports on Form&#160;8-K dated February 23, April 28 and August 12, 2011, our current report on Form&#160;8&#8209;K/A dated July 30, 2010 and filed on March 16, 2011 and our current report on Form 8-K/A dated April 28, 2011 and filed on August 9, 2011; and</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-bottom:12px;font-family:Times New Roman; font-size:10pt; width:100%;"><tr><td style="width:48px;"></td><td></td></tr><tr><td style="vertical-align:top"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:inherit;font-size:10pt;">&#8226;</font></div></td><td style="vertical-align:top;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">the description of our common stock contained in our registration statement on Form&#160;8&#8209;A filed with the SEC on March 27, 2000 pursuant to Section 12 of the Securities Exchange Act of 1934, including any amendments and reports filed for the purpose of updating such description.</font></div></td></tr></table><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Any statement contained in a document incorporated or deemed to be incorporated by reference in this prospectus will be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained in this prospectus or in any other subsequently filed document which also is or is deemed to be incorporated by reference in this prospectus modifies or supersedes that statement.  Any statement that is modified or superseded will not constitute a part of this prospectus, except as so modified or superseded.  You may rely on any statement contained in this prospectus or in documents incorporated or deemed to be incorporated in this prospectus, unless that statement has been subsequently modified or superseded as described above prior to the time you make your investment decision.</font></div><div style="line-height:120%;padding-bottom:10px;text-align:left;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Upon your written or oral request, we will provide you at no cost a copy of any or all of the documents incorporated by reference in this prospectus, other than the exhibits to those documents, unless the exhibits are specifically incorporated by reference into this prospectus.  You may request a copy of these documents by contacting:</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Investor Relations</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Lexicon Pharmaceuticals, Inc.</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">8800 Technology Forest Place</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The Woodlands, Texas 77381-1160</font></div><div style="line-height:120%;text-align:left;padding-left:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Telephone: (281) 863-3000</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br></font></div><br><div><div style="line-height:120%;text-align:center;font-size:10pt;"><font style="font-family:inherit;">19</font></div></div>	</body>
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