Repligen Corporation is a leading provider of advanced bioprocessing technologies and solutions used by large biopharmaceutical companies and contract manufacturing organizations for manufacturing biologic drugs, such as monoclonal antibodies (mAbs) and gene therapies. Repligen earns revenues from the sale of several products, which can be categorized mainly under three segments, namely Filtration, Chromatography and Protein products. The chromatography products include OPUS and OPUS PD chromatography columns, chromatography resins and ELISA test kits. Filtration products consist of XCell Alternating Tangential Flow (ATF) Systems and consumables, KrosFlo filtration products and SIUS filtration products. Protein products comprise the Protein A ligands and cell culture growth factors.