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" ... At Harvard Medical School, Clifford Tabin, Patrick Tschopp and colleagues looked for the origin of this genital tubercle by studying embryos of mice, birds and reptiles. What they found was a bit of a surprise, said Tschopp in an interview. In snakes and lizards, the external genitalia start out as cells from the “limb buds” – groups of cells that go on to form limbs in animals that have limbs. In snakes, the buds form but the limb development gets interrupted. ... "