Absence of response to levodopa in Parkinson's disease.
D001921:Brain / Q000378:metabolism; D003937:Diagnosis, Differential; D004295:Dihydroxyphenylalanine / Q000008:administration & dosage / Q000378:metabolism / Q000627:therapeutic use*; D006801:Humans; D010300:Parkinson Disease / Q000175:diagnosis / Q000188:drug therapy*; D010648:Phenylacetates / Q000134:cerebrospinal fluid; D013997:Time Factors
D010648:Phenylacetates; D004295:Dihydroxyphenylalanine