This article explains that there is now evidence (the first of its kind) that the University of California, San Diego School of Medicine believe could link Darwinian sexual selection, cell surface sugars, and “immune functions in the context of human origins”. They believe that when early hominids lost the ability to make a specific sugar molecule (N-glycolylneuraminic acid or Neu5Gc) about two to three million years ago, that they were better protected from disease because of a gene mutation (and started producing Neu5Ac).
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