keratin defined in 1951 yearkeratin - keratin;
keratin - Tough fibrous protein containing much sulphur, occurring in epidermis of vertebrates, forming resistant outermost layer of skin, and also hair, feathers, horny scales, nails, claws, hooves, and outer coating of horns of cows, sheep, etc. Keratinization is transformation of epidermal cells into keratin, which occurs in formation of above structures.
near keratin in Knolik
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