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Among mammals, the hair (including wool), horns, nails, claws, corns, and hooves, which are made primarily of α-keratins

Among reptiles, the scales, claws, and, in the chelonians, such as tortoise, turtle, terrapin, the shells, which are made primarily of β-keratins

Among birds, the feathers, beaks, and claws, which are made primarily of β-keratins

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mena michel

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4y ago

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