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 In the Skin of a Lion In the Skin of a Lion is a novel by Canadian–Sri Lankan writer Michael Ondaatje. It was first published in 1987 by McClelland and Stewart. The novel fictionalizes the lives of the immigrants who played a large role in the building of the city of Toronto in the early 1900s, but whose contributions never became part of the city's official history. Ondaatje illuminates the investment of these settlers in Canada, through their labour, while they remain outsiders to mainstream society. "In the Skin of a Lion" is thus an exposé of the migrant condition: