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October 23 2013

Origins of teeth turned outside-in

Teeth may have evolved from scales on the outside of animal bodies, before being trapped in the mouth by the evolution of the jaw, say scientists.

For decades, it's been thought that bony materials originated as teeth in the mouths of predators, before spreading out over the body surface to form skeletal scales. But a new study, published in Nature, turns the inside-out theory, outside-in.

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