title: Morphine, enkephalin and the substantia gelatinosa.
mesh_terms: D000200:Action Potentials / Q000187:drug effects; D000818:Animals; D002415:Cats; D009020:Morphine / Q000494:pharmacology*; D009270:Naloxone / Q000494:pharmacology; D009419:Nerve Tissue Proteins / Q000494:pharmacology*; D009842:Oligopeptides / Q000494:pharmacology*; D010146:Pain / Q000503:physiopathology; D011957:Receptors, Opioid / Q000502:physiology*; D013116:Spinal Cord / Q000187:drug effects*; D013376:Substantia Gelatinosa / Q000187:drug effects* / Q000502:physiology
chemical_list: D009419:Nerve Tissue Proteins; D009842:Oligopeptides; D011957:Receptors, Opioid; D009270:Naloxone; D009020:Morphine