<SEC-DOCUMENT>0001140361-12-020948.txt : 20120419
<SEC-HEADER>0001140361-12-020948.hdr.sgml : 20120419
<ACCEPTANCE-DATETIME>20120419185724
ACCESSION NUMBER:		0001140361-12-020948
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20120411
FILED AS OF DATE:		20120419
DATE AS OF CHANGE:		20120419

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			REPLIGEN CORP
		CENTRAL INDEX KEY:			0000730272
		STANDARD INDUSTRIAL CLASSIFICATION:	BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
		IRS NUMBER:				042729386
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		41 SEYON STREET
		STREET 2:		BUILDING 1, SUITE 100
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453
		BUSINESS PHONE:		7814499560

	MAIL ADDRESS:	
		STREET 1:		41 SEYON STREET
		STREET 2:		BUILDING 1, SUITE 100
		CITY:			WALTHAM
		STATE:			MA
		ZIP:			02453

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GRIFFITH MICHAEL A
		CENTRAL INDEX KEY:			0001241821

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14656
		FILM NUMBER:		12769288

	MAIL ADDRESS:	
		STREET 1:		7700 BONHOMME AVENUE
		CITY:			ST. LOUIS
		STATE:			MO
		ZIP:			63105
</SEC-HEADER>
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<DESCRIPTION>FORM 3
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    <periodOfReport>2012-04-11</periodOfReport>

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        <issuerName>REPLIGEN CORP</issuerName>
        <issuerTradingSymbol>RGEN</issuerTradingSymbol>
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            <rptOwnerName>GRIFFITH MICHAEL A</rptOwnerName>
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            <rptOwnerStreet1>C/O REPLIGEN CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>41 SEYON STREET</rptOwnerStreet2>
            <rptOwnerCity>WALTHAM</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02453</rptOwnerZipCode>
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        <signatureName>/s/ William J. Kelly (Attorney in Fact)</signatureName>
        <signatureDate>2012-04-19</signatureDate>
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<div style="TEXT-INDENT: 0pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt"><font style="DISPLAY: inline; FONT-WEIGHT: bold">LIMITED</font> <font style="DISPLAY: inline; FONT-WEIGHT: bold">POWER OF ATTORNEY</font></font></div>

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<div style="TEXT-INDENT: 36pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="justify"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">Know all by these presents, that the undersigned hereby constitutes and appoints Walter Herlihy, William Kelly and Art McGivern, the undersigned&#8217;s true and lawful attorney-in-fact to:</font></div>

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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">execute for and on behalf of the undersigned, in the undersigned&#8217;s capacity as an officer, director and/or stockholder of Repligen Corporation (the &#8220;Company&#8221;), Forms&#160;3, 4, and 5 and amendments thereto in accordance with Section&#160;16(a) of the Securities Exchange Act of 1934 and the rules thereunder;</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form&#160;3, 4, or 5 and any amendments thereto and timely file such forms with the SEC and any stock exchange or similar authority; and</font></div>
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<div align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">take any other action of any type whatsoever which, in the opinion of such attorney-in-fact, may be necessary or desirable in connection with the foregoing authority, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact&#8217;s discretion.</font></div>
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<div style="TEXT-INDENT: 36pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">&#160;</font></div>

<div style="TEXT-INDENT: 36pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">The undersigned hereby grants to such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact&#8217;s substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.&#160;&#160;The undersigned acknowledges that the foregoing attorney-in-fact, in serving in such capacity at the request of the undersigned, is not assuming, nor is the Company assuming, any of the undersigned&#8217;s responsibilities to comply with Section&#160;16 of the Securities Exchange Act of 1934.</font></div>

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<div style="TEXT-INDENT: 36pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms&#160;3, 4, and 5 with respect to the undersigned&#8217;s holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorney-in-fact.&#160;&#160;&#160;This Power of Attorney may be filed with the SEC as a confirming statement of the authority granted herein.</font></div>

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<div style="TEXT-INDENT: 36pt; DISPLAY: block; MARGIN-LEFT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-FAMILY: Times New Roman; FONT-SIZE: 10pt">IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 19th day of April, 2012.</font></div>

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