title: Letter: Tryptophan in depression.
mesh_terms: D002986:Clinical Trials as Topic; D003863:Depression / Q000188:drug therapy* / Q000628:therapy; D004357:Drug Synergism; D004565:Electroconvulsive Therapy; D006801:Humans; D008996:Monoamine Oxidase Inhibitors / Q000627:therapeutic use; D014364:Tryptophan / Q000627:therapeutic use*
chemical_list: D008996:Monoamine Oxidase Inhibitors; D014364:Tryptophan