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 '
In the Skin of a Lion "It is a novel about the wearing and the removal of masks; the shedding of skin, the transformations and translations of identity." An important aspect of the novel is its depiction of Toronto in the 1930s. Ondaatje spent many months in the archives of the City of Toronto and newspapers of the era. Prominence is given to the construction of two Toronto landmarks, the Prince Edward Viaduct, commonly known as the Bloor Street Viaduct, and the R. C. Harris Water Treatment Plant, and focuses on the lives of the immigrant workers. The plot incorporates a number of true stories of