title: Considerations on the nature of mu, kappa, and sigma receptors.
abstract: It is assumed that opioid receptors are flexible, distorted by agonists but not by antagonists. Combined with Martin's model of the receptors, this assumption permits reasonable interpretation of experimental facts.
authors.affiliation: Department of Pharmacology, Hahnemann University School of Medicine, Philadelphia, Pennsylvania 19102.
authors.forename: A
authors.initials: A
authors.lastname: Gero
mesh_terms: D001665:Binding Sites; D004723:Endorphins / Q000378:metabolism; D008959:Models, Neurological; D011957:Receptors, Opioid / Q000378:metabolism*; D017465:Receptors, Opioid, delta; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu; D017480:Receptors, sigma
chemical_list: D004723:Endorphins; D011957:Receptors, Opioid; D017465:Receptors, Opioid, delta; D017473:Receptors, Opioid, kappa; D017450:Receptors, Opioid, mu; D017480:Receptors, sigma