title: Seasonal variation in the apparent number of binding sites for 3H-opioid agonists and antagonists.
mesh_terms: D000818:Animals; D001665:Binding Sites; D001921:Brain / Q000378:metabolism*; D004090:Dihydromorphine / Q000378:metabolism; D004723:Endorphins / Q000378:metabolism*; D004744:Enkephalin, Methionine / Q000031:analogs & derivatives*; D004745:Enkephalins / Q000378:metabolism*; D005260:Female; D007700:Kinetics; D008297:Male; D051379:Mice; D009019:Morphinans / Q000378:metabolism*; D009020:Morphine / Q000378:metabolism; D009270:Naloxone / Q000378:metabolism; D009271:Naltrexone / Q000378:metabolism; D011957:Receptors, Opioid / Q000502:physiology*; D012621:Seasons
chemical_list: D004723:Endorphins; D004745:Enkephalins; D009019:Morphinans; D011957:Receptors, Opioid; D009270:Naloxone; D004744:Enkephalin, Methionine; D009271:Naltrexone; C022118:enkephalinamide-Met, Ala(2)-; D009020:Morphine; D004090:Dihydromorphine