title: Changing concepts of keratin.
mesh_terms: D000818:Animals; D004817:Epidermis / Q000378:metabolism; D004848:Epithelium / Q000378:metabolism*; D006197:Hair / Q000378:metabolism; D006801:Humans; D007633:Keratins / Q000096:biosynthesis*; D009262:Nails / Q000378:metabolism; D010455:Peptides / Q000378:metabolism*
chemical_list: D010455:Peptides; D007633:Keratins