WALTHAM, Mass., Jan. 29 /PRNewswire-FirstCall/ -- Repligen Corporation (Nasdaq: RGEN) announced today that the Company President and Chief Executive Officer, Walter C. Herlihy, Ph.D., will host a conference call and webcast on Thursday, February 4th, 2010 at 10:00 a.m. EST, to report third quarter fiscal year 2010 financial results and to provide a quarterly update of the Company.