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Frogs aren't known for their fabulous manes, but the claws of frogs are helping us learn why humans have hair -- thanks to a homeobox gene and a weird evolutionary shift.
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Sources: https://docs.google.com/document/u/1/d/e/2PACX-1vQHO0rk8yh2N3xVoHD_2N3QYYEDHCkFAyZID71_mCvrfWGqQ5hDk8AUXGlMQjb0N2Qy-85-tU-whyeH/pub