Repligen Corporation Announces Conference Call For Second Quarter Fiscal Year 2006 Results Thursday, November 3rd, 11:00 A.M. EST

WALTHAM, Mass., Oct. 27 /PRNewswire-FirstCall/ -- Repligen Corporation announced today that the Company President and Chief Executive Officer, Walter C. Herlihy, Ph.D., will host a conference call and webcast on Thursday, November 3rd at 11:00 a.m. EST, to report second quarter fiscal year 2006 financial results and to provide a quarterly update of the Company.

This call is being webcast by CCBN and can be accessed via Repligen's website at http://www.repligen.com. If you are unable to access the webcast via the internet, you may also listen to the live broadcast by calling (866) 831-6224 for domestic calls and (617) 213-8853 for international calls. Participants must provide the following passcode: 20784622. For those who cannot participate in the live conference call, an archive of the audio webcast will be available shortly after the call and may be accessed at http://www.repligen.com.

About Repligen Corporation

Repligen Corporation is a biopharmaceutical company committed to being the leader in the development of novel therapeutics for profound neuropsychiatric disorders and autoimmune disease. Repligen has a Specialty Pharmaceuticals business comprised of rProtein A(TM) and SecreFlo(R), the profits from which will be used to partially support the development of our proprietary products. Repligen's corporate headquarters are located at 41 Seyon Street, Building #1, Suite 100, Waltham, MA 02453. Additional information may be requested from http://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. The forward-looking statements in this release do not constitute guarantees of future performance. Investors are cautioned that statements in this press release which are not strictly historical statements, including, without limitation, statements regarding current or future financial performance and position, management's strategy, plans and objectives for future operations, plans and objectives for product development, plans and objectives for present and future clinical trials and results of such trials, plans and objectives for regulatory approval, litigation, intellectual property, product development, manufacturing plans and performance such as the anticipated growth in the monoclonal antibody market and our other target markets and projected growth in product sales, 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: the success of current and future collaborative relationships, the market acceptance of our products, our ability to compete with larger, better financed pharmaceutical and biotechnology companies, new approaches to the treatment of our targeted diseases, our expectation of incurring continued losses, our uncertainty of product revenues and profits, our ability to generate future revenues, our ability to raise additional capital to continue our drug development programs, the success of our clinical trials, our ability to develop and commercialize products, our ability to obtain required regulatory approvals, our compliance with all Food and Drug Administration 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 and manufacturing capabilities, our dependence on third-party manufacturers and value added resellers, our ability to hire and retain skilled personnel, our volatile stock price, and other risks detailed in Repligen's filings with the Securities and Exchange Commission. Repligen assumes no obligation to update any forward-looking information contained in this press release or with respect to the announcements described herein.

CONTACT: Walter C. Herlihy, Ph.D., President and Chief Executive Officer,+1-781-250-0111, ext. 2000, or Laura Whitehouse, Vice President, MarketDevelopment, +1-781-250-0111, ext. 2306, both of Repligen

Web site: http://www.repligen.com//