This document describes the services of Custom Biologics, a company that provides bioassay design, validation, and testing services. It has three divisions focused on small molecules, large molecules, and molecular diagnostics. It operates a GLP-compliant quality system and has qualified assays for many biologics. Services include functional assays, immunogenicity testing, PK/TK studies, protein characterization, and host cell testing. The company works with biosimilars and has accurate cell-based assays to evaluate potency levels of biosimilars compared to originators.