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From Fins to Wings
NOVEMBER 2006
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Genus Saimiri
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Squirrel Monkey
Photograph by Rosamond Purcell
In most animals, like this squirrel monkey, Hox genes switch on early in the development of the embryo. Like a mapmaker's grid, the genes divide the blob-like embryo into compartments where specialized structures—ribs, vertebrae, limbs, eyes, the head—later take shape. "The monkey has a typical vertebrate body plan, with the addition of the long tail," says biologist Sean Carroll.
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