title: Nitrous oxide at analgesic concentrations--an opiate agonist: further evidence.
mesh_terms: D000698:Analgesia; D000818:Animals; D006801:Humans; D009609:Nitrous Oxide / Q000494:pharmacology*; D011957:Receptors, Opioid / Q000187:drug effects*
chemical_list: D011957:Receptors, Opioid; D009609:Nitrous Oxide