what substance are nails made up of
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A nail is a horn-like envelope covering the tips of the fingers and toes in most primates and a few other mammals. Nails are similar to claws in other animals. Fingernails and toenails are made of a tough protective proteincalled alpha-keratin. This protein is also found in the hooves and horns of different animals.
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the nails are made of keratin
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