title: Letter: Multiple sclerosis.
mesh_terms: D003300:Copper / Q000172:deficiency / Q000378:metabolism; D003711:Demyelinating Diseases / Q000150:complications / Q000209:etiology; D006801:Humans; D009103:Multiple Sclerosis / Q000209:etiology* / Q000378:metabolism; D014801:Vitamin A / Q000378:metabolism; D014802:Vitamin A Deficiency / Q000150:complications
chemical_list: D014801:Vitamin A; D003300:Copper