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Joy, one of five cloned knockout piglets produced by Dai et.al. (p. 251). The gene inactivated in these pigs, α 1,3 galactosyl transferase, synthesizes an antigen involved in the immune rejection of pig to human transplants.
Two reports on the knockout of one allele of the α1,3-galactosyltransferase gene in pigs bring us one step closer to the transplantation of pig organs into people.