title: No pain, no gain?
authors.forename: M
authors.initials: M
authors.lastname: Holloway
mesh_terms: D000818:Animals; D004723:Endorphins / Q000502:physiology*; D008526:Medulla Oblongata / Q000503:physiopathology*; D009020:Morphine / Q000008:administration & dosage; D010146:Pain / Q000503:physiopathology*; D051381:Rats
chemical_list: D004723:Endorphins; D009020:Morphine