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Birth defects

  • A python embryo turns its leg cells into a pair of penises. Researchers now believe that signals from the embryonic gut trigger the development of the penis in many different species.
    HEALTH
    How Boy Bits First Came To Be
    Geoff Brumfiel
    Certain birth defects in male children are on the rise, and nobody knows why. Scientists say basic research into how external genitalia evolved in reptiles and rodents might offer a few clues.