es are baboons, chimpanzees, and pigs. "A total of thirty-one transplants of solid organs from animals into humans were carried out in the US and South Africa between 1963 and 1993, using organs from chimpanzees, baboons, monkeys and pigs. The majority of these have been kidney transplants, but heart and liver transplants have also been carried out. The level of success of these procedures has varied greatly, with patients surviving for between two hours and, in one early case, nine months. The majority of patients receiving cross species transplants do not survive for longer than one month following the operation. In the few cases in which organ failure or rejection did not occur, the patients died as a result of infections which could not be fought by their suppressed immune systems."2 At current time, there as been no record of a successful xenotransplant. However, recent advances in genetics have made it possible to engineer animals, such as pigs, which have specific combinations of human antigens. This could allow animals to be engineered whose organs have human antigens precisely matching those of a transplant patient. T
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