Search Results for: Birds’ egg
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 , turtle , terrapin, the shells, which are made primarily of β-keratins among birds
like their analogs in other vertebrate classes. hair and other α-keratins consist of α-helically-coiled single protein strands (with regular intra-chain h-bonding ), which are then further wound together into superhelical or coiled-coil ropes that may be further coiled. the β-keratins of reptiles and birds...
https://www.newworldencyclopedia.org/entry/Keratin