Image of the Day: Snake Embryo
In corn snake (Pantherophis guttatus) embyros like this one, genes once associated exclusively with limb development are now known to play roles in developing external genitalia.
CARLOS R. INFANTE(See "Shared enhancer activity in the limbs and phallus and functional divergence of a limb-genital cis-regulatory element in snakes," Developmental Cell, 2015.)
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