title: Opiate receptors: different ligand affinity in various brain regions.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D001921:Brain / Q000378:metabolism*; D003496:Cyclazocine / Q000031:analogs & derivatives / Q000378:metabolism; D004285:Dogs; D004745:Enkephalins / Q000378:metabolism; D004983:Ethanolamines / Q000378:metabolism; D008024:Ligands; D009020:Morphine / Q000378:metabolism; D009022:Morphine Derivatives / Q000378:metabolism; D011957:Receptors, Opioid / Q000378:metabolism*; D013237:Stereoisomerism; D013997:Time Factors
chemical_list: D004745:Enkephalins; D004983:Ethanolamines; D008024:Ligands; D009022:Morphine Derivatives; D011957:Receptors, Opioid; D009020:Morphine; D003496:Cyclazocine