a fibrous, structural protein that is the principal constituent of hoofs, nails, claws, talons, bills, horn, hair, feathers, etc., and that is found in the outermost layers of skin.
更多keratin例句
Light scattering off of microscopic layers of air, the protein keratin and melanin-containing structures called melanosomes creates iridescent feathers’ sheen.
Rhino horns are made of keratin, the same protein found in our fingernails.
Keratin is particularly rich in sulphur, and is quite insoluble in cold water.
Keratin, a substance forming the chief constituent in the hair, nails, and horn of animals.