title: Electron microscopic fine structure of internal part of a scalp hair which underwent sudden change from black to gray.
mesh_terms: D000328:Adult; D006197:Hair / Q000378:metabolism / Q000648:ultrastructure*; D006200:Hair Color; D006801:Humans; D008297:Male; D008543:Melanins / Q000032:analysis; D008854:Microscopy, Electron
chemical_list: D008543:Melanins