<SEC-DOCUMENT>0001144204-13-027995.txt : 20130510
<SEC-HEADER>0001144204-13-027995.hdr.sgml : 20130510
<ACCEPTANCE-DATETIME>20130510164115
ACCESSION NUMBER:		0001144204-13-027995
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20130510
DATE AS OF CHANGE:		20130510
GROUP MEMBERS:		FELIX J. BAKER
GROUP MEMBERS:		JULIAN C. BAKER

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CERUS CORP
		CENTRAL INDEX KEY:			0001020214
		STANDARD INDUSTRIAL CLASSIFICATION:	SURGICAL & MEDICAL INSTRUMENTS & APPARATUS [3841]
		IRS NUMBER:				680262011
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-51875
		FILM NUMBER:		13834097

	BUSINESS ADDRESS:	
		STREET 1:		2550 STANWELL DRIVE
		CITY:			CONCORD
		STATE:			CA
		ZIP:			94520
		BUSINESS PHONE:		9252886000

	MAIL ADDRESS:	
		STREET 1:		2550 STANWELL DRIVE
		STREET 2:		STE 300
		CITY:			CONCORD
		STATE:			CA
		ZIP:			94520

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CERUS TECHNOLOGIES INC
		DATE OF NAME CHANGE:	19960731

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BAKER BROS ADVISORS LLC
		CENTRAL INDEX KEY:			0001263508
		IRS NUMBER:				134093645
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		667 MADISON AVE
		STREET 2:		21ST FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10065
		BUSINESS PHONE:		2123395600

	MAIL ADDRESS:	
		STREET 1:		667 MADISON AVE
		STREET 2:		21ST FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10065
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>v344540_sc13g.htm
<DESCRIPTION>SC 13G
<TEXT>
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<P STYLE="margin: 0">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SCHEDULE 13G</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">SECURITIES AND EXCHANGE COMMISSION</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">WASHINGTON, DC 20549</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-weight: normal">Under
the Securities Exchange Act of 1934</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-weight: normal">(Amendment
No. )*</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 100%; border-bottom: windowtext 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Cerus Corporation</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Name of Issuer)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Common Stock, par value $0.001 per share</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Title of Class of Securities)</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="font: 10pt Times New Roman, Times, Serif; width: 75%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 100%; border-bottom: windowtext 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>157085101</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(CUSIP Number)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>April 2, 2013</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(Date of Event which Requires Filing of this Statement)</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify; text-indent: 0.5in"><B>Check
the appropriate box to designate the rule pursuant to which this Schedule is filed:</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><FONT STYLE="font-family: Wingdings"><B>x</B></FONT><B>
Rule 13d-1(b)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><FONT STYLE="font-family: Wingdings"><B>&uml;</B></FONT><B>
Rule 13d-1(c)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in"><FONT STYLE="font-family: Wingdings"><B>&uml;</B></FONT><B>
Rule 13d-1(d)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: left; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: left; text-indent: 0.5in"><B>*The remainder
of this cover page shall be filled out for a reporting person&rsquo;s initial filing on this form with respect to the subject class
of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover
page.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: left; text-indent: 0.5in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: left; text-indent: 0.5in"><B>The information
required on the remainder of this cover page shall not be deemed to be &ldquo;filed&rdquo; for the purpose of Section&nbsp;18 of
the Securities Exchange Act of 1934 (the &ldquo;Act&rdquo;) or otherwise subject to the liabilities of that section of the Act,
but shall be subject to all other provisions of the Act (however, see the Notes).</B></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center; text-indent: 0in"><B>&nbsp;</B></P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0"><B></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0in"><B>CUSIP No. &nbsp;<U>157085101</U></B></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0"><B></B></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>1</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>NAMES OF REPORTING PERSONS</B><BR>
        <B>I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Baker Bros. Advisors, LLC</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">13-4093645</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>&nbsp;</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD NOWRAP STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; width: 5%; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>2</B></FONT></TD>
    <TD NOWRAP STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt; width: 90%"><FONT STYLE="font-size: 10pt"><B>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) </B></FONT></TD>
    <TD NOWRAP STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid; width: 5%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(a) <FONT STYLE="font-family: Wingdings">&uml;</FONT></B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(b) <FONT STYLE="font-family: Wingdings">&uml;</FONT>&nbsp;</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>3</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SEC USE ONLY</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-left: windowtext 1pt solid; border-right: black 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>4</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;CITIZENSHIP OR PLACE OF ORGANIZATION</B></FONT><BR>
<BR>
<FONT STYLE="font-size: 10pt"><B>&nbsp;&nbsp;</B>Delaware</FONT></TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0"></P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD ROWSPAN="4" STYLE="width: 22%; border: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>NUMBER OF<BR>
        SHARES<BR>
        BENEFICIALLY<BR>
        OWNED BY<BR>
        EACH<BR>
        REPORTING<BR>
        PERSON<BR>
        WITH</B></P></TD>
    <TD STYLE="vertical-align: top; width: 5%; border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>5</B></FONT></TD>
    <TD STYLE="vertical-align: top; width: 73%; border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SOLE VOTING POWER</B></FONT><BR>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8,455,306</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>6</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SHARED VOTING POWER</B></FONT><BR>
<FONT STYLE="font-size: 10pt"><B>&nbsp;&nbsp;</B></FONT><BR>
<FONT STYLE="font-size: 10pt">&nbsp;&nbsp;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;<B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B>-0-&nbsp;&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>7</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SOLE DISPOSITIVE POWER</B></FONT><BR>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8,455,306</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>8</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SHARED DISPOSITIVE POWER</B></FONT><BR>
<BR>
<FONT STYLE="font-size: 10pt">&nbsp;&nbsp;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-0-</TD></TR>
</TABLE>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>9</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
PERSON</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B></B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">8,455,306</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; width: 5%; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>10</B></FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; width: 90%">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES</B>&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(See Instructions)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid; font-size: 10pt; width: 5%"><FONT STYLE="font: 10pt Wingdings"><B>&uml;</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>11</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">12.1% (1)</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>12</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>TYPE OF REPORTING PERSON (See Instructions)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in">IA</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"></P></TD></TR>
</TABLE>


<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Based on 69,716,000 shares of common stock outstanding as reported in the Issuer&rsquo;s Form 10-Q filed with the SEC on May
3, 2013.</TD></TR></TABLE>



<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0in"><B>CUSIP No. &nbsp;<U>157085101</U></B></P>



<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>1</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>NAMES OF REPORTING PERSONS</B><BR>
        <B>I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9.35pt">Felix J. Baker</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>&nbsp;</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 5%; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>2</B></FONT></TD>
    <TD STYLE="border-bottom: black 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) </B></FONT></TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(a) <FONT STYLE="font-family: Wingdings">&uml;</FONT></B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(b) <FONT STYLE="font-family: Wingdings">&uml;</FONT></B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><B>&nbsp;</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>3</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>SEC USE ONLY</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-left: windowtext 1pt solid; border-right: black 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>4</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>CITIZENSHIP OR PLACE OF ORGANIZATION&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">United States</P></TD></TR>
</TABLE>


<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD ROWSPAN="4" STYLE="width: 22%; border: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>NUMBER OF<BR>
        SHARES<BR>
        BENEFICIALLY<BR>
        OWNED BY<BR>
        EACH<BR>
        REPORTING<BR>
        PERSON<BR>
        WITH</B></P></TD>
    <TD STYLE="vertical-align: top; width: 5%; border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>5</B></FONT></TD>
    <TD STYLE="vertical-align: top; width: 73%; border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SOLE VOTING POWER</B></FONT><BR>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8,455,306</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>6</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SHARED
VOTING POWER</B></FONT><BR>
<FONT STYLE="font-size: 10pt"><B>&nbsp;&nbsp;</B></FONT><BR>
<FONT STYLE="font-size: 10pt">&nbsp;&nbsp;</FONT><B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B>-0-&nbsp;&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>7</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SOLE DISPOSITIVE POWER</B></FONT><BR>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8,455,306</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>8</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SHARED DISPOSITIVE POWER</B></FONT><BR>
<BR>
<FONT STYLE="font-size: 10pt">&nbsp;&nbsp;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-0-</TD></TR>
</TABLE>


<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: black 1pt solid; border-left: windowtext 1pt solid; border-bottom: black 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>9</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">8,455,306</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; width: 5%; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>10</B></FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN
        SHARES </B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(See Instructions)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P></TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font: 10pt Wingdings"><B>&uml;</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>11</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0"><B>PERCENT OF CLASS REPRESENTED BY
        AMOUNT IN ROW 9</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">12.1% (1)</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>12</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>TYPE OF REPORTING PERSON (See Instructions)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">&nbsp;</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">IN, HC</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P></TD></TR>
</TABLE>


<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="margin-top: 0; margin-bottom: 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Based on 69,716,000 shares of common stock outstanding as reported in the Issuer&rsquo;s Form 10-Q filed with the SEC on May
3, 2013.</TD></TR></TABLE>



<P STYLE="margin-top: 0; margin-bottom: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0in"><B>CUSIP No. &nbsp;<U>157085101</U></B></P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center; border-top: Black 1pt solid"><FONT STYLE="font-size: 18pt"><B>1</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: Black 1pt solid; border-bottom: Black 1pt solid; font-size: 10pt; border-top: Black 1pt solid"><FONT STYLE="font-size: 10pt"><B>&nbsp;NAMES OF REPORTING PERSONS</B></FONT><BR>
<FONT STYLE="font-size: 10pt"><B>&nbsp;I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only)</B></FONT><BR>
<BR>
<FONT STYLE="font-size: 10pt"><B>&nbsp;&nbsp;</B>Julian C. Baker</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; width: 5%; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>2</B></FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) </B></FONT></TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(a) <FONT STYLE="font-family: Wingdings">&uml;</FONT></B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(b) <FONT STYLE="font-family: Wingdings">&uml;</FONT></B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>3</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SEC USE ONLY</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-left: windowtext 1pt solid; border-right: black 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>4</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;CITIZENSHIP OR PLACE OF ORGANIZATION</B></FONT><BR>
<BR>
<FONT STYLE="font-size: 10pt"><B>&nbsp;&nbsp;</B>United States</FONT></TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR>
    <TD ROWSPAN="4" STYLE="width: 17%; border: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>NUMBER OF<BR>
        SHARES<BR>
        BENEFICIALLY<BR>
        OWNED BY<BR>
        EACH<BR>
        REPORTING<BR>
        PERSON<BR>
        WITH</B></P></TD>
    <TD STYLE="vertical-align: top; width: 5%; border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>5</B></FONT></TD>
    <TD STYLE="vertical-align: top; width: 78%; border-top: windowtext 1pt solid; border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SOLE VOTING POWER</B></FONT><BR>
<BR>
<B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B>8,455,306</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>6</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SHARED VOTING POWER</B></FONT><BR>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-0-</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>7</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SOLE DISPOSITIVE POWER</B></FONT><BR>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8,455,306</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>8</B></FONT></TD>
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>&nbsp;SHARED DISPOSITIVE POWER</B></FONT><BR>
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-0-</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: black 1pt solid; border-left: windowtext 1pt solid; border-bottom: black 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>9</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1pt solid; border-bottom: black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
PERSON</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">8,455,306</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; width: 5%; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>10</B></FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
CERTAIN SHARES</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B></B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>(See Instructions)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P></TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid; font-size: 10pt"><FONT STYLE="font: 10pt Wingdings"><B>&uml;</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>11</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B></B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">12.1% (1)</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="border-right: windowtext 1pt solid; border-bottom: windowtext 1pt solid; border-left: windowtext 1pt solid; font-size: 18pt; text-align: center"><FONT STYLE="font-size: 18pt"><B>12</B></FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: windowtext 1pt solid; border-right: windowtext 1pt solid">
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>TYPE OF REPORTING PERSON (See Instructions)</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 9pt">IN, HC</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P></TD></TR>
</TABLE>


<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.5in"></TD><TD STYLE="width: 0.25in">(1)</TD><TD>Based on 69,716,000 shares of common stock outstanding as reported in the Issuer&rsquo;s Form 10-Q filed with the SEC on May
3, 2013.</TD></TR></TABLE>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 1(a)</B></TD><TD STYLE="text-align: justify"><B>Name of Issuer:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">Cerus Corporation (the
&ldquo;Issuer&rdquo;)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item1 (b)</B></TD><TD STYLE="text-align: justify"><B>Address of Issuer&rsquo;s Principal Executive Offices:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">2550 Stanwell Drive</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">Concord, California 94520</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 2(a)</B></TD><TD STYLE="text-align: justify"><B>Name of Person Filing:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 1in">This Schedule 13G is being
filed jointly by Baker Bros. Advisors, LLC, Felix J. Baker and Julian C. Baker (collectively, the &ldquo;Reporting Persons&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 2(b)</B></TD><TD STYLE="text-align: justify"><B>Address of Principal Business Office or, if None,
Residence:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">The business address of each of
the Reporting Persons is:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">c/o Baker Bros. Advisors, LLC</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">667 Madison Avenue, 21<SUP>st</SUP>
Floor</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-indent: 0.5in">New York, NY 10065</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">(212) 339-5633</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 2(c)</B></TD><TD STYLE="text-align: justify"><B>Citizenship:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in">Baker Bros. Advisors, LLC (the &ldquo;Adviser&rdquo;)
is a limited liability company organized under the laws of the state of Delaware. The citizenship of each of Julian C. Baker and
Felix J. Baker is the United States of America.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0in"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 2(d)</B></TD><TD STYLE="text-align: justify"><B>Title of Class of Securities:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-align: left; text-indent: 0in">Common Stock, par
value $0.001 per share (&ldquo;Common Stock&rdquo;)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 2(e)</B></TD><TD STYLE="text-align: justify"><B>CUSIP Number:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">&#9;<B>157085101</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 3.</B></TD><TD STYLE="text-align: justify"><B>If this statement is filed pursuant to &sect;&sect;240.13d-1(b)
or (c), check whether the person filing is a:</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(a) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
Broker or dealer registered under Section 15 of the Exchange Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(b) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
Bank as defined in section 3(a)(6) of the Exchange Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>


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    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(c) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
Insurance company as defined in section 3(a)(19) of the Exchange Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(d) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
Investment company registered under section 8 of the Investment Company Act of 1940.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(e) <FONT STYLE="font: 10pt Wingdings">x</FONT>
An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(f) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(g) <FONT STYLE="font: 10pt Wingdings">x</FONT>
A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(h) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(i) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act
of 1940.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">(j) <FONT STYLE="font: 10pt Wingdings">&uml;</FONT>
Group, in accordance with Rule 13d-1(b)(1)(ii)(J).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 4.</B></TD><TD STYLE="text-align: justify"><B>Ownership.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Items 5 through 9 and 11 of each of the cover pages to this
Schedule 13G are incorporated herein reference. Set forth below is the aggregate number of shares of Common Stock of the Issuer
directly held by each of the Funds (as defined below), which may be deemed to be indirectly beneficially owned by the Reporting
Persons. Such shares of Common Stock are directly held by each of Baker Brothers Life Sciences, L.P. (&ldquo;Life Sciences&rdquo;),
14159, L.P. (&ldquo;14159&rdquo;), and 667, L.P. (&ldquo;667&rdquo;, and together with Life Sciences and 14159, the &ldquo;Funds&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" ALIGN="CENTER" STYLE="border-collapse: collapse; width: 65%; font: 10pt Times New Roman, Times, Serif">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid">Name</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="text-align: center; border-bottom: Black 1pt solid">Number of <BR>Shares of <BR>Common <BR>Stock</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="width: 79%; text-align: left">667, L.P.</TD><TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 1%; text-align: left">&nbsp;</TD><TD STYLE="width: 18%; text-align: right">795,199</TD><TD STYLE="width: 1%; text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="text-align: left">Baker Brothers Life Sciences, L.P.</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">7,475,203</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD STYLE="text-align: left; padding-bottom: 1pt">14159, L.P.</TD><TD STYLE="padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="text-align: right; border-bottom: Black 1pt solid">&nbsp;</TD><TD STYLE="text-align: right; border-bottom: Black 1pt solid">184,904</TD><TD STYLE="text-align: left; padding-bottom: 1pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: White">
    <TD>&nbsp;</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">&nbsp;</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: rgb(204,255,204)">
    <TD>Total</TD><TD>&nbsp;</TD>
    <TD STYLE="text-align: left">&nbsp;</TD><TD STYLE="text-align: right">8,455,306</TD><TD STYLE="text-align: left">&nbsp;</TD></TR>
</TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">On April 12, 2012, the Adviser, each of the Funds, and the general
partners of the Funds entered into an amended and restated management agreement (the &ldquo;Management Agreement&rdquo;) which
gave the Adviser complete and unlimited discretion and authority with respect to the Funds&rsquo; investments and voting power
over investments. The general partners of the Funds relinquished all discretion and authority with respect to the Funds&rsquo;
investments and voting power over investments. In connection with the services provided by the Adviser to the Funds, the Adviser
receives a management based fee that does not confer any pecuniary interest.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">By virtue of the Management Agreement, the Adviser and Felix
J. Baker and Julian C. Baker, as principals of the Adviser, may be deemed to be beneficial owners of securities owned by the Funds,
and may be deemed to have the power to vote or direct the vote of and the power to dispose or direct the disposition of such securities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Felix J. Baker and Julian C. Baker disclaim beneficial ownership
of the securities held by each of the Funds, and this Schedule 13G shall not be deemed an admission that Felix J. Baker or Julian
C. Baker is the beneficial owner of such securities for purposes of Section 13(d) or for any other purpose.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 5.</B></TD><TD STYLE="text-align: justify"><B>Ownership of Five Percent or Less of a Class.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 1in">If this statement is being
filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five
percent of the class of securities, check the following <FONT STYLE="font-family: Wingdings 2">&#163;</FONT>.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 6.</B></TD><TD STYLE="text-align: justify"><B>Ownership of More than Five Percent on Behalf of Another
Person.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">N/A</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 7.</B></TD><TD STYLE="text-align: justify"><B>Identification and Classification of the Subsidiary
Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">The information in Item
4 is incorporated herein by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 8.</B></TD><TD STYLE="text-align: justify"><B>Identification and Classification of Members of the
Group.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">N/A</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 9.</B></TD><TD STYLE="text-align: justify"><B>Notice of Dissolution of Group.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 1in">N/A</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0; margin-bottom: 0"><TR STYLE="vertical-align: top; text-align: justify">
<TD STYLE="width: 0in"></TD><TD STYLE="width: 1in; text-align: left"><B>Item 10.</B></TD><TD STYLE="text-align: justify"><B>Certification.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">By signing below I certify that, to the best
of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and
were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of
the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose
or effect.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>


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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 2.25pt; text-align: center">SIGNATURE</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this statement is true, complete and correct.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 3in; text-indent: -3in">May 10, 2013</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 3in; text-indent: -3in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 3in; text-indent: -3in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-size: 10pt"><B>BAKER BROS. ADVISORS, LLC</B></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 4%; font-size: 10pt">By:</TD>
    <TD STYLE="width: 46%; border-bottom: windowtext 1pt solid; font-size: 10pt">/s/ Scott L. Lessing</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Name: Scott L. Lessing</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Title: President</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt">/s/ Julian C. Baker</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">Julian C. Baker</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt">/s/ Felix J. Baker</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">Felix J. Baker</TD></TR>
</TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right; text-indent: 0"><B>EXHIBIT A</B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>AGREEMENT</B></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: left; text-indent: 0in">In accordance with Rule&nbsp;13d-1(k)(1)
under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that this Statement on Schedule&nbsp;13G relating
to the Common Stock of Cerus Corporation is being filed with the Securities and Exchange Commission on behalf of each of them.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">May 10, 2013</P>

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    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-size: 10pt"><B>BAKER BROS. ADVISORS, LLC</B></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 4%; font-size: 10pt">&nbsp;</TD>
    <TD STYLE="width: 46%; font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">By:</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt">/s/ Scott L. Lessing</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Name: Scott L. Lessing</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Title: President</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt">/s/ Julian C. Baker</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">Julian C. Baker</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="border-bottom: windowtext 1pt solid; font-size: 10pt">/s/ Felix J. Baker</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt">Felix J. Baker</TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>



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