title: Opioid and nonopioid forms of stress-induced analgesia: some environmental determinants and characteristics.
mesh_terms: D000818:Animals; D001143:Arousal / Q000502:physiology; D004597:Electroshock; D005239:Fear / Q000502:physiology; D008297:Male; D009115:Muridae; D009619:Nociceptors / Q000502:physiology*; D011957:Receptors, Opioid / Q000502:physiology*; D012931:Social Environment; D013312:Stress, Physiological / Q000503:physiopathology*; D013623:Tail / Q000294:innervation
chemical_list: D011957:Receptors, Opioid