| http://www.w3.org/ns/prov#value | - ??? ??? ??? Integument A covering or skin ??? ??? ??? Integumentary system The skin and its glands, hair, nails, and other structures that are derived from it ??? ??? ??? Epidermis The top layer of skin, consisting of four or five layers ??? ??? ??? Keratin A waterproofing scleroprotein that hardens over several days ??? ??? ??? Keratogenesis The formation of keratin, a horny material ??? ??? ???
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