A new genome-wide analysis of both humans and chimpanzees reveals that the two species have shared some of the same combinations of mutations that result in polymorphisms, or different physical forms within the same species, for millions of years. Until now, only two shared polymorphisms between humans and apes had been identified: variants in the major histocompatibility complex, or MHC, and polymorphisms at the ABO blood group system, which underlies various blood types.
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