title: Multiple mu opiate receptors: biochemical and pharmacological evidence for multiplicity.
mesh_terms: D000818:Animals; D004090:Dihydromorphine / Q000378:metabolism; D004745:Enkephalins / Q000378:metabolism; D006801:Humans; D009020:Morphine / Q000378:metabolism; D010146:Pain / Q000503:physiopathology; D011957:Receptors, Opioid / Q000145:classification* / Q000378:metabolism / Q000502:physiology; D017450:Receptors, Opioid, mu
chemical_list: D004745:Enkephalins; D011957:Receptors, Opioid; D017450:Receptors, Opioid, mu; D009020:Morphine; D004090:Dihydromorphine