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'''{{FULLPAGENAME}}''' is defined as "a hard, fibrous, sulphur-containing protein with an alpha-helix structure, found in the epidermis of vertebrates, mainly in the outermost layers of skin. Keratin can have several forms: in scales, feathers, hooves, horns, claws and nails it is hard, while wool and hair are made up of a soft and flexible form."<ref>{{REFweb

|url=https://medical-dictionary.thefreedictionary.com/keratin