MENU ( 0 ITEMS ) SIGN IN Inspiring Advances in Bioprocessing Advancing filtration technology | Repligen welcomes Spectrum Repligen has acquired Spectrum Inc., based in Rancho Dominguez, California, USA, a market leader in bioprocess filtration with expertise in hollow fiber technology. Together, the two companies now offer the broadest range of hollow fiber and flat sheet filtration technologies for cell culture and purification. LEARN MORE XCELL™ ATF 10 SINGLE-USE IS HERE ULTIMATE FLEXIBILITY FROM PRE-PACKED TO UNPACKED: OPUS® 45R AND OPUS® 60R COLUMNS In the News Balancing the up and downstream: Repligen CEO talks R&D and M&A BioPharma Reporter READ MORE TANGENX™ SOLUTIONS FOR TANGENTIAL FLOW FILTRATION JOIN THE REPLIGEN TEAM Seminar OCT 12 2017 Advances in Bioprocessing Basel, Switzerland REGISTER TODAY LEADER OF THE PACK: ATOLL COLUMNS ARE NOW OPUS® COLUMNS FOR PROCESS DEVELOPMENT Stock quote RGEN 38.50 As of 12:00 AM ET Investors SEP 15, 2017 REPLIGEN ANNOUNCES ANALYST DAY AND WEBCAST AUG 30, 2017 REPLIGEN TO PRESENT AT BAIRD’S 2017 GLOBAL HEALTHCARE CONFERENCE INVESTORS © COPYRIGHT 2017 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY

MENU ( 0 ITEMS ) SIGN IN ELISA Kits ELISA Kits deliver fast, reliable, and reproducible quantitation of leached Protein A, MabSelect SuRe™ ligand and LONG®R3 IGF-I. BUY NOW EXPAND ALL Protein A ELISA Kit for MabSelect SuRe™ Ligand Protein A ELISA Kit for Native and Recombinant Protein A LONG®R3 IGF-I ELISA Kit Technology Protein A detection Protein A quantitation Reproducibility Sample preparation protocols Resources MabSelect™, MabSelect SuRe™ and SuRe™ are registered trademarks of GE Healthcare. © COPYRIGHT 2016 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY

MENU ( 0 ITEMS ) SIGN IN Online store This online store is for credit card and Paypal purchases only of selected products. All prices are in US Dollars and subject to change without notice. Shipping and taxes, if applicable, will be calculated at checkout. For non-listed products and/or sizes, please request a quote. REQUEST A QUOTE EXPAND ALL Protein A Affinity Resins Cell Culture Supplements ELISA Kits Need to use a Purchase Order? Please send the PO by email to this address and we will process your order as soon as possible. SALES@REPLIGEN.COM © COPYRIGHT 2016 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY

MENU ( 0 ITEMS ) SIGN IN Protein A Ligands Leader in Protein A ligand manufacturing since 1985. Most of the world's commercial monoclonal antibodies are purified using native and recombinant Protein A ligands manufactured by Repligen. BUY NOW < 1 GRAM REQUEST A QUOTE > 1 GRAM EXPAND ALL Repligen announces extension of long -term Supply Agreement for Protein A rSPA – Native Recombinant Staphylococcal Protein A Ligand srPA50 – Legacy recombinant Protein A Ligand rPA50 – Legacy recombinant Protein A Ligand Native Protein A Ligand Technology Resources © COPYRIGHT 2016 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY