title: Possible role of the endogenous opioid system in the placebo response in depression.
authors.forename: F J
authors.initials: FJ
authors.lastname: Lichtigfeld
authors.forename: M A
authors.initials: MA
authors.lastname: Gillman
mesh_terms: D003866:Depressive Disorder / Q000503:physiopathology* / Q000523:psychology* / Q000628:therapy; D004723:Endorphins / Q000502:physiology*; D006801:Humans; D009609:Nitrous Oxide / Q000378:metabolism; D015990:Placebo Effect
chemical_list: D004723:Endorphins; D009609:Nitrous Oxide