Word: individualn
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...difficulty-and the reason doctors rarely try organ grafts on humans-is biochemical. One of nature's inexorable laws is that the mammalian body (like all animals' from amphibians up) will reject, attack and eventually destroy any invading material from another individualn.* In experiments with dogs, and in the few attempts on humans, this "rejection reaction" has invariably killed the graft. Only in the case of identical twins, who are in effect the same person biochemically, have grafts of skin or organs been completely successful. Since 1954 the Harvard-Brigham team has performed eleven successful kidney transplants between...
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