About SecreFlo™SecreFlo™ is a synthetic version of the human hormone secretin. When used in combination with magnetic resonance imaging (MRI), SecreFlo™ offers a safe, reliable and lower-cost alternative to the diagnostic use of endoscopic retrograde cholangio-pancreatography (ERCP) in examining and evaluating patients with pancreatitis. The medical community has recognized the need for a safer diagnostic approach based on documented morbidity and mortality risks associated with the diagnostic use of ERCP and current practice recommendations issued by the National Institutes of Health (NIH). MRI offers a safer and noninvasive alternative to diagnostic ERCP; however, its utility is currently limited by the lack of an approved agent to clarify MRI images of the pancreatic ducts in order to achieve a definitive diagnosis. SecreFlo™ in combination with MRI is designed to fill this unmet need. There are approximately 300,000 abdominal MRI procedures conducted in the U.S. and Europe each year that may directly benefit from the addition of SecreFlo™. In addition to priority review designation, SecreFlo™ has also been granted Orphan Drug status in the U.S., which qualifies Repligen to receive seven years of U.S. market exclusivity for SecreFlo™, if approved. About Repligen Corporation Repligen Corporation is a leading supplier of critical biologic products used to manufacture biologic drugs. Repligen also applies its expertise in biologic product development to SecreFlo™, a synthetic hormone being developed as a novel imaging agent for the diagnosis of a variety of pancreatic diseases. In addition, the Company has two central nervous system (CNS) rare disease programs in Phase 1 clinical trials. Repligen’s corporate headquarters are located at 41 Seyon Street, Building #1, Suite 100, Waltham, MA 02453. Additional information may be requested at www.repligen.com. This press release contains forward-looking statements, which are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Investors are cautioned that statements in this press release which are not strictly historical statements, including, without limitation, express or implied statements regarding future financial performance and position, the Food and Drug Administration approval of our NDA for SecreFlo™ , plans and objectives for future operations, plans and objectives for product development, plans and objectives for regulatory approval, product development, our market share and product sales and other statements identified by words like “believe,” “expect,” “may,” “will,” “should,” “seek,” or “could” and similar expressions, constitute forward-looking statements. Such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated, including, without limitation, risks associated with: our ability to develop and commercialize products and the market acceptance of our products; reduced demand for our products that adversely impacts our future revenues, cash flows, results of operations and financial condition; the ability to obtain, and the timing and receipt of, FDA approval for our NDA; our ability to obtain other required regulatory approvals; the success of current and future collaborative or supply relationships; our ability to compete with larger, better financed bioprocessing, pharmaceutical and biotechnology companies; the success of our clinical trials; new approaches to the treatment of our targeted diseases; our compliance with all Food and Drug Administration and EMEA regulations; our ability to obtain, maintain and protect intellectual property rights for our products; the risk of litigation regarding our intellectual property rights; our limited sales capabilities; our volatile stock price; and other risks detailed in Repligen’s annual report on Form 10-K on file with the Securities and Exchange Commission and the other reports that Repligen periodically files with the Securities and Exchange Commission. Actual results may differ materially from those Repligen contemplated by these forward-looking statements. These forward looking statements reflect management’s current views and Repligen does not undertake to update any of these forward-looking statements to reflect a change in its views or events or circumstances that occur after the date hereof except as required by law.