Keratin, a kind of protein, exists widely in human and animal organs, including epidermis, hairs, wool, feather, hoof and horn.It is a natural compound material with good properties.

• 角蛋白是蛋白质的一种,广泛存在于人和动物的表皮、毛发以及动物的蹄、壳、爪、角中,是一类性能优良的天然生物复合材料。