;
;a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair feathers nails and hooves.
外层皮肤和头发、皮肤、指甲及蹄等组织里的纤维硬
。
a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair feathers nails and hooves.
外层皮肤和头发、皮肤、指甲及蹄等组织里的纤维硬。
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