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 '
Mr. and Mrs. Is the Name Mr. and Mrs. Is the Name Mr. and Mrs. Is the Name is a 1935 animated "Merrie Melodies" cartoon, starring Buddy and Cookie (as two mer-kids), and is noted to be the only Buddy cartoon in Technicolor. This is directed by Friz Freleng. Mermaids sing to the audience about mermaids and fishes at play; they and some other sea creatures dance to the song. A young merman who resembles Buddy plays tag with a mermaid resembling Cookie, but she is offended when he "tags" her a bit too hard. Buddy looks inside a sunken ship and drags Cookie to it.