Repligen Corp. has completed an 11,000-sq.-ft. expansion of its U.S. manufacturing facility in Waltham, which now includes a dedicated space for the production and assembly of Repligen’s Alternating Tangential Flow System (ATF System), a recent addition to the company’s upstream bioprocessing product portfolio.   The ATF System is used to increase cell density and product yield during the fermentation step of the biologic drug manufacturing process. The expansion includes areas for A...