MENU ( 0 ITEMS ) SIGN IN Inspiring Advances in Bioprocessing Repligen Selects Purolite Life Sciences as Commercial Partner for New High Performance Ligand Repligen Corporation announced it has entered into an agreement with Purolite Life Sciences to supply its next-generation Protein A ligand, NGL-Impact™ A, which will be commercialized by Purolite Life Sciences using their novel Praesto® agarose jetting base bead technology. LEARN MORE SCALE WITH OPUS®: INTRODUCING OPUS® 80R WALKAWAY TFF AUTOMATION WITH KONDUIT News Sartorius Stedim Biotech and Repligen Partner to Introduce Next-Generation Perfusion-Enabled Bioreactors READ MORE CONTINUOUS BIOPROCESSING: A REPLIGEN E-BOOK JOIN THE REPLIGEN TEAM In the News Highly Rated 'Surgeon' For Biologic-Drug Makers Soars 85% In 2018 Investor's Business Daily READ MORE OPUS® COLUMNS FOR PROCESS DEVELOPMENT Stock quote RGEN 55.10 As of 12:00 AM ET Investors JAN 03, 2019 REPLIGEN TO PRESENT AT 37TH ANNUAL J.P. MORGAN HEALTHCARE CONFERENCE NOV 01, 2018 REPLIGEN REPORTS THIRD QUARTER 2018 FINANCIAL RESULTS INVESTORS News Repligen Announces Agreement with Navigo Proteins READ MORE © COPYRIGHT 2019 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY

MENU ( 0 ITEMS ) SIGN IN Media optimization - Growth factors Growth factors play a critical role in media optimization, contributing to long-term growth and rapid proliferation of cell lines in serum-free media formulations. MEDIA OPTIMIZATION - GROWTH FACTORS EXPAND ALL Background Common cell culture growth factors LONG®R3 IGF-I CELL CULTURE GROWTH FACTOR EXPAND ALL Technology Performance Resources FREQUENTLY ASKED QUESTIONS - LONG®R3 IGF-I LONG®R3 IGF-I is not approved or permitted for use in any human application. Repligen provides LONG®R3 IGF-I only to qualified customers expressly for use in cell culture supplementation or for other research purposes. SAFC® is a registered trademark of Merck KGaA. © COPYRIGHT 2018 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY

MENU ( 0 ITEMS ) SIGN IN Analytics ELISA Kits ELISA Kits deliver fast, reliable, and reproducible quantitation of leached Protein A, MabSelect SuRe™ ligand and LONG®R3 IGF-I. ELISA KITS © COPYRIGHT 2018 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY

MENU ( 0 ITEMS ) SIGN IN Selected Quality documents Repligen facilities operate according to ISO 9001 Quality Management Systems (QMS), with the aim of building quality into every Repligen product. EXPAND ALL Quality System Management documents User Guides Regulatory Support Files Safety Data Sheets Certificates of Analysis - Examples Quality and Animal-free statements © COPYRIGHT 2018 REPLIGEN CORPORATION. ALL RIGHTS RESERVED. STORE CAREERS CONTACT LEGAL PRIVACY POLICY