TRANSPLANTING ORGANS FROM ANIMALS TO HUMANS.HAS XENOTRANPLANTATION GONE TOO FAR? In January 2002,Dr Sochs, a professor of surgery and immunology at Harvard school of medicine with his colleagues reported that they had successfully made a clone of pigs in which one copy of a particular gene had been "knocked out" of their DNA. This "knocked out" gene codes for a sugar molecule called galactose alpha (1-3-galactose) found on the cells of the pig. This molecule is recognized as foreign by the human immune system. During evolution, humans and primates like monkeys and apes lost the enzyme that...
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