Premium US Origin Fetal Bovine Serum is collected aseptically from the unborn fetus of ***** bovine brought to slaughter. The Serum is separated aseptically from the blood of the fetus which is allowed to spontaneously clot. The raw serum is stored frozen at -20 deg C or below until processed by aseptic filtration. 100 of the serum is collected from USDA licensed abbatoirs located within the U.S. The animals are inspected by a licensed veterinarian pre and post slaughter and are certified free of diseases of clawed animals. The sera is kept under quarantine in a USDA approved facility until tested and released for sale by USDA. Material is processed in an FDA registered facility under cGMP.Heat inactivation protocol is to bring the temperature of the material to 56 deg C and maintain this for 30 minutes. Some precipitation may be evident, which can be removed, if desired, by filtration.