Keratin is a protein that comprises your nails. It is also found in skin, horn, feathers, and claws. Different levels of amino acids determine if the keratin will be soft or hard. When keratin weakens, like when skin cells die, it is simply replaced by new keratin.
Keratin is a scleroprotein or albuminoid substance, found in the dead outerskin layer,
and in horn, hair, feathers, hoofs, nails, claws, bills, etc.
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