Keratin is a protein extracted from the hooves, horns, nails, and hair of animals. (as defined here)
Keratin is a fibrous structural protein derived from certain species such as arthropods, crustaceans, whales, roundworms, turtles, tortoises, and from the hooves, horns, nails, claws and hair from mammals.
Keratin is found in the parts of animals that contain hair-like materials (horns on rams, for instance, is hair that hardened over millions of years of evolution) or within the hair of an animal itself.
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