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SEC Company Response from REPLIGEN CORP (RGEN) (CIK 0000730272) (RGEN) — Mar 13, 2007

REPLIGEN CORP (RGEN) (CIK 0000730272)
Date: March 13, 2007 · CIK: 0000730272 · Accession: 0001193125-07-053259

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Referenced dates: March 5, 2007

Date
March 13, 2007
Author
/s/ Daniel W. Muehl
Form
CORRESP
Company
REPLIGEN CORP (RGEN) (CIK 0000730272)

Letter

United States Securities and Exchange Commission Division of Corporation Finance Washington, D.C. 20549-7010 Attention: Jim B. Rosenberg / Mark Brunhofer Re: Repligen Corporation Form 10-K for Fiscal Year Ended March 31, 2006 : File No. 0-14656

Dear Gentlemen:

This letter is being furnished on behalf of Repligen Corporation (the “Company”) in response to comments in the letter dated March 5, 2007 (the “Letter”) from Jim B. Rosenberg of the Staff (the “Staff”) of the Securities and Exchange Commission (the “Commission”) to Walter C. Herlihy, President and Chief Executive Officer of the Company, with respect to the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2006 (the “Form 10-K”) that was filed with the Commission on June 9, 2006.

We respectfully request an extension of time until April 5, 2007 to provide our response. This will provide the time needed to fully and adequately prepare and review the response with all applicable parties. Thank you for your consideration in this matter.

If you require additional information, please telephone the undersigned at (781) 419-1850.

Sincerely,
/s/ Daniel W. Muehl

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CORRESP
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SEC RESPONSE LETTER

 RepliGen

 Repligen Corporation

 41 Seyon
Street, Bldg #1

 Waltham, MA 02453-8335

 Telephone: 781-250-0111

 Telefax : 781-250-0115

                 March 13, 2007

 United States Securities and
Exchange Commission

 Division of Corporation Finance

 100 F
Street, N.E.

 Washington, D.C. 20549-7010

 Attention: Jim B.
Rosenberg / Mark Brunhofer

Re:
Repligen Corporation

Form 10-K for Fiscal Year Ended March 31, 2006 : File No. 0-14656

 Dear Gentlemen:

 This letter is being furnished on behalf of Repligen Corporation (the “Company”) in
response to comments in the letter dated March 5, 2007 (the “Letter”) from Jim B. Rosenberg of the Staff (the “Staff”) of the Securities and Exchange Commission (the “Commission”) to Walter C.
Herlihy, President and Chief Executive Officer of the Company, with respect to the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2006 (the “Form 10-K”) that was filed with the Commission on
June 9, 2006.

 We respectfully request an extension of time until April 5, 2007 to provide our response. This will provide the time needed to
fully and adequately prepare and review the response with all applicable parties. Thank you for your consideration in this matter.

 If you require
additional information, please telephone the undersigned at (781) 419-1850.

 Sincerely,

 /s/ Daniel W. Muehl

 Daniel W. Muehl

 Chief Financial Officer

 Repligen Corporation