Keratin Keratin Keratin () is one of a family of fibrous structural proteins. It is the key structural material making up hair, horns, claws, hooves, and the outer layer of human skin. Keratin is also the protein that protects epithelial cells from damage or stress. Keratin is extremely insoluble in water and organic solvents. Keratin monomers assemble into bundles to form intermediate filaments, which are tough and form strong unmineralized epidermal appendages found in reptiles, birds, amphibians, and mammals. The only other biological matter known to approximate the toughness of keratinized tissue is chitin. Keratin derives from Greek ' from '
The Skin I Live In about to be used malevolently, assume a dreamy, otherworldly quality. "The Skin I Live In" is the work of a master near the top of his game." Upon its UK premiere, Peter Bradshaw gave it (four of five stars), calling it "fantastically twisted" and "a truly macabre suspense thriller"—"Banderas is a wonderfully charismatic leading man; Almodóvar has found in him what Hitchcock found in Cary Grant. He is stylish, debonair, but with a chilling touch of determination and menace." In an October 2011 "New York Times" Critics' Pick review, Manohla Dargis called the film "an existential mystery, a melodramatic thriller,