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 '
Skin Deep (The Outer Limits) Skin Deep (The Outer Limits) "Skin Deep" is an episode of "The Outer Limits" television show. It was first-aired at 4 February 2000, during the sixth season. Sid Camden gets a hold of an experimental holographic disguise device that allows him to acquire the image of his handsome co-worker, Chad Warner... Sid Camden, a rather unremarkable, socially inept man, works in an accounting department of a high-tech company known as "Veil-Tech". He spends much of his spare time in chatrooms. One day Hal, one of the project managers, secretly loans Sid a prototype of one of the company's latest developments