SEC Comment Letter for REPLIGEN CORP (RGEN) (CIK 0000730272) (RGEN) — May 23, 2007

REPLIGEN CORP (RGEN) (CIK 0000730272)
Date: May 23, 2007 · CIK: 0000730272 · Accession: 0000000000-07-025726

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Date

May 23, 2007

Author

Not clearly detected

Form

UPLOAD

Company

REPLIGEN CORP (RGEN) (CIK 0000730272)

Letter

Via Facsimile and U.S. Mail Mail Stop 6010 May 23, 2007 Mr. Walter C. Herlihy Chief Executive Officer and President Repligen Corporation 41 Seyon Street Building 1, Suite 100 Waltham, MA 02453

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

Dear Mr. Herlihy:

We have completed our review of your Form 10-K and have no further comments at this time.

S i n c e r e l y ,

James Atkinson Branch Chief

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Via Facsimile and U.S. Mail
Mail Stop 6010
        May 23, 2007

Mr. Walter C. Herlihy
Chief Executive Officer and President
Repligen Corporation
41 Seyon Street
Building 1, Suite 100
Waltham, MA   02453

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

Dear Mr. Herlihy:

 We have completed our review of your Form 10-K and have no further comments
at this time.

        S i n c e r e l y ,

James Atkinson
Branch Chief

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