title: Opiate receptor subclasses differ in their conformational requirements.
mesh_terms: D000818:Animals; D001667:Binding, Competitive; D001921:Brain / Q000378:metabolism; D002462:Cell Membrane / Q000378:metabolism; D004745:Enkephalins / Q000378:metabolism; D008024:Ligands; D009270:Naloxone / Q000378:metabolism; D011487:Protein Conformation; D051381:Rats; D011957:Receptors, Opioid / Q000145:classification* / Q000378:metabolism; D013329:Structure-Activity Relationship
chemical_list: D004745:Enkephalins; D008024:Ligands; D011957:Receptors, Opioid; D009270:Naloxone