Search Results for: Tortoise shell
are the chief constituent of structures that grow from the skin of vertebrates . these structures include: among mammals , the hair (including wool), horns, nails, claws, corns, and hooves, which are made primarily of α-keratins among reptiles , the scales , claws, and, in the chelonians, such as tortoise
frequently modified by being embedded in a hardened proteinaceous matrix of keratin, giving a more rigid exoskeleton, than seen, for example, in the use of chitin in the soft, more pliable body wall of a caterpillar . keratins also can be integrated in the chitinophosphatic material that makes up the shell...
https://www.newworldencyclopedia.org/entry/Keratin