Medicine: Transplanted Hearts

Many a surgeon dreams of the day when, like the mechanic faced with a worn-out fuel pump, he will be able to dip into a bank of human spare parts and fix up his patient with a replacement ailing organ−even one so vital to life as a kidney or the heart itself. So far, apart from the difficulty of obtaining such spare organs, two obstacles have seemed insuperable: 1) the surgical difficulties of making all the necessary blood-vessel connections in time, and 2) the immune reaction which causes a recipient to manufacture antibodies that destroy any foreign blood-containing tissue. Last...

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