title: Letter: Rigidity in Huntington's chorea.
mesh_terms: D001479:Basal Ganglia / Q000378:metabolism; D001921:Brain / Q000473:pathology; D004295:Dihydroxyphenylalanine / Q000627:therapeutic use; D004298:Dopamine / Q000378:metabolism; D006801:Humans; D006816:Huntington Disease / Q000150:complications / Q000188:drug therapy / Q000473:pathology / Q000503:physiopathology*; D009127:Muscle Rigidity / Q000150:complications / Q000209:etiology*; D010300:Parkinson Disease / Q000378:metabolism
chemical_list: D004295:Dihydroxyphenylalanine; D004298:Dopamine