title: Clinical effects of tryptophan in chronic schizophrenic patients.
mesh_terms: D000328:Adult; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D004341:Drug Evaluation; D006801:Humans; D008297:Male; D010919:Placebos; D011736:Pyridoxine / Q000627:therapeutic use; D012559:Schizophrenia / Q000188:drug therapy*; D014364:Tryptophan / Q000627:therapeutic use*
chemical_list: D010919:Placebos; D014364:Tryptophan; D011736:Pyridoxine