Replacement with an aortic valve homograft should be performed if feasible. Today, cryopreservation is the method of choice for homograft preservation. The durability of homograft valves is probably the same as for porcine tissue valves. The transplant is called an allograft, allogeneic transplant, or homograft. Homograft valves are donated by patients and recovered after the patient expires. As autopsies were much fewer, homograft valve development was even less viable.