title: Affinity labels as probes for opioid receptor types and subtypes.
mesh_terms: D000345:Affinity Labels / Q000494:pharmacology*; D000818:Animals; D007700:Kinetics; D009271:Naltrexone / Q000031:analogs & derivatives / Q000494:pharmacology; D011957:Receptors, Opioid / Q000187:drug effects / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D000345:Affinity Labels; D011957:Receptors, Opioid; D009271:Naltrexone