title: On the role of endogenous opioid peptides: failure of naloxone to influence shock escape threshold in the rat.
mesh_terms: D000818:Animals; D001923:Brain Chemistry; D004924:Escape Reaction / Q000187:drug effects*; D008297:Male; D009020:Morphine / Q000494:pharmacology; D009270:Naloxone / Q000494:pharmacology*; D009842:Oligopeptides / Q000502:physiology*; D009892:Opium; D010146:Pain / Q000503:physiopathology*; D010902:Pituitary Gland / Q000502:physiology; D051381:Rats; D011955:Receptors, Drug / Q000187:drug effects
chemical_list: D009842:Oligopeptides; D011955:Receptors, Drug; D009270:Naloxone; D009020:Morphine; D009892:Opium