title: Evidence contradicting the notion that gonadal hormones regulate brain opiate receptors.
mesh_terms: D000818:Animals; D001921:Brain / Q000378:metabolism*; D004744:Enkephalin, Methionine / Q000378:metabolism; D005260:Female; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009270:Naloxone / Q000378:metabolism; D010053:Ovary / Q000502:physiology*; D011957:Receptors, Opioid / Q000378:metabolism*; D013737:Testis / Q000502:physiology*; D014018:Tissue Distribution
chemical_list: D011957:Receptors, Opioid; D009270:Naloxone; D004744:Enkephalin, Methionine