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 Name of this Book is Secret his hair with equality.He likes all school-taught subjects and likes solving riddles. Ms. Mauvais and Dr. L – Ms. Mauvais and Dr. L are the two antagonists of the story. They seem to know the cause of Pietro's death and are desperate to find his song, which contains information about the secret the series revolves around. Once they find out Cass and Max-Ernest have his notebook, they go to many lengths to take it from them. It is also revealed during the story that Dr. L is Pietro's brother Luciano after Cass discovers a birthmark of a crescent moon on