title: Stress-induced parallel changes in central opioid levels and pain responsiveness in the rat.
mesh_terms: D000818:Animals; D001921:Brain / Q000502:physiology*; D009270:Naloxone / Q000494:pharmacology; D009419:Nerve Tissue Proteins / Q000502:physiology*; D010146:Pain / Q000503:physiopathology*; D010455:Peptides / Q000502:physiology*; D051381:Rats; D011957:Receptors, Opioid / Q000502:physiology*; D013312:Stress, Physiological / Q000503:physiopathology*; D013997:Time Factors
chemical_list: D009419:Nerve Tissue Proteins; D010455:Peptides; D011957:Receptors, Opioid; D009270:Naloxone