Definition of Keratin

a strong natural protein that is the base of hair, nails, hoofs, and horns

Examples of Keratin in a sentence

Although other proteins are found in skin cells, keratin makes up a large percentage of these tissues.  

Keratin is a durable and flexible protein that makes up animal hooves and gives them strength.  

Because it is such a strong protein, keratin provides natural protection for human hair.  

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