Prionex®, a very effective BSA alternate, is a 10% aqueous solution of a polypeptide fraction of highly purified dermal collagen of porcine origin. It has excellent protein stabilizing properties. Prionex® is prepared by partial hydrolysis and is terminally sterilized. It is free from cartilage, bone and plasma components and is therefore a pure form of partially hydrolyzed gelatine type A.