Snakes Use 'Leg Genes' to Make Phalluses

Snakes lack limbs, but new research finds that they still have DNA crucial to limb development lurking in their genomes. A new study, published today (Oct. 1) in the journal Developmental Cell, reveals that the same genetic snippets that control the outgrowth of limbs (called enhancers) during embryonic development in mammals are crucial to the development of the phallus in both mammals and reptiles — including legless snakes. "It tells us that we are a little bit myopic in thinking about