title: Effect of vitamin B 6  on levodopa-induced changes in spinal fluid homovanillic acid.
mesh_terms: D004295:Dihydroxyphenylalanine / Q000378:metabolism / Q000627:therapeutic use*; D004298:Dopamine / Q000378:metabolism; D005260:Female; D006801:Humans; D008875:Middle Aged; D010300:Parkinson Disease / Q000134:cerebrospinal fluid / Q000188:drug therapy*; D010648:Phenylacetates / Q000134:cerebrospinal fluid* / Q000378:metabolism; D011736:Pyridoxine / Q000494:pharmacology*
chemical_list: D010648:Phenylacetates; D004295:Dihydroxyphenylalanine; D011736:Pyridoxine; D004298:Dopamine