title: Failed levodopa therapy in striato-nigral degeneration.
mesh_terms: D002986:Clinical Trials as Topic; D004295:Dihydroxyphenylalanine / Q000627:therapeutic use*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009410:Nerve Degeneration / Q000187:drug effects*; D010300:Parkinson Disease / Q000188:drug therapy*
chemical_list: D004295:Dihydroxyphenylalanine