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Major Repligen (Nasdaq: RGEN) Shareholder Files Amended 13D
Date:3/5/2012

CHICAGO, March 5, 2012 /PRNewswire/ --

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Schedule 13DUnder the Securities Exchange Act of 1934
(Amendment No. 7)*REPLIGEN CORP
(Name of Issuer)Common Stock, Par Value $0.01 Per Share
(Title of Class of Securities)759916 10 9
(CUSIP Number)

Barry L. Fischer
Thompson Coburn LLP
55 East Monroe Street
Suite 3700
Chicago, IL 60603
(312) 346-75
(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)March 5, 2012
(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of Rule 13d-1(e), (f) or (g), check the following box .

Note:  Schedules filed in paper format shall include a signed original and five copies of the Schedule, including all exhibits.  See Rule 13d-7(b) for other parties to whom copies are being sent.

*The remainder of this cover page shall be filled out for a reporting person'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.

The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") 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).1NAMES OF REPORTING PERSON

 

 

Individual Retirement Accounts for the benefit of Ronald L. Chez and Ronald L. Chez Individually2CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions)
(a)  (b)

 3SEC USE ONLY

 4SOURCE OF FUNDS (See Instructio
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SOURCE Ronald L. Chez, Inc.
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