title: Long-term depression of a reflex and the possible involvement of an opioid [proceedings].
mesh_terms: D000818:Animals; D009020:Morphine / Q000502:physiology*; D009046:Motor Neurons / Q000502:physiology; D009132:Muscles / Q000294:innervation*; D009270:Naloxone / Q000494:pharmacology; D011817:Rabbits; D012018:Reflex / Q000187:drug effects / Q000502:physiology*
chemical_list: D009270:Naloxone; D009020:Morphine