title: A critical review of the classification of opioid receptors.
authors.affiliation: Department of Pharmacology, Wellcome Research Laboratories, Beckenham, Kent, United Kingdom.
authors.forename: I G
authors.initials: IG
authors.lastname: Dougall
mesh_terms: D006801:Humans; D011957:Receptors, Opioid / Q000032:analysis* / Q000187:drug effects
chemical_list: D011957:Receptors, Opioid