Hair, nails, and the outer layer of the skin are made mostly of a tough waterproof protein called:

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    Elastin
    Collegen
    Cerumen
    Keratin
asked May 27, 2013 in Anatomy & Physiology by anonymous
    

1 Answer

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Keratin
answered May 28, 2013 by NewSky ~Expert~ (2,450 points)

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