Thermo Scientific HyClone Defined Fetal Bovine Serum (FBS), U.S. Origin, meets stringent testing standards, ensures no viral contaminants, and includes a wide-ranging biochemical profile.HyClone Defined Fetal Bovine Serum (FBS), U.S. origin, is filtered using 40nm (0.04µm) pore-size filters and processed using îTrue Poolî processing technology to ensure consistency in the quality of serum. Defined FBS is widely used by professionals who have a concern for viral contaminants, require an extensive biochemical profile, and require full traceability compliant with current Good Manufacturing Practices (cGMP). Defined FBS is <=10EU/mL Endotoxin and <=10mg/mL Hemoglobin.