title: Cu2+ probe of metal-ion binding sites in melanin using electron paramagentic resonance spectroscopy. II. Natural melanin.
mesh_terms: D000818:Animals; D002417:Cattle; D002625:Chemistry, Organic; D003300:Copper; D004578:Electron Spin Resonance Spectroscopy; D005123:Eye; D006863:Hydrogen-Ion Concentration; D008543:Melanins; D055601:Organic Chemistry Phenomena
chemical_list: D008543:Melanins; D003300:Copper