title: Demonstration of two classes of opiate binding sites in the nervous tissue of the marine mollusc Mytilus edulis. Positive homotropic cooperativity of lower affinity binding sites.
mesh_terms: D000818:Animals; D001665:Binding Sites; D001667:Binding, Competitive; D049872:Bivalvia / Q000378:metabolism*; D002462:Cell Membrane / Q000378:metabolism; D005405:D-Ala(2),MePhe(4),Met(0)-ol-enkephalin; D004723:Endorphins / Q000378:metabolism*; D004744:Enkephalin, Methionine / Q000031:analogs & derivatives* / Q000378:metabolism; D005048:Etorphine / Q000378:metabolism*; D005724:Ganglia / Q000378:metabolism*; D007700:Kinetics; D007977:Levallorphan / Q000378:metabolism*; D009019:Morphinans / Q000378:metabolism*; D011957:Receptors, Opioid / Q000378:metabolism*
chemical_list: D004723:Endorphins; D009019:Morphinans; D011957:Receptors, Opioid; D007977:Levallorphan; D005048:Etorphine; D004744:Enkephalin, Methionine; D005405:D-Ala(2),MePhe(4),Met(0)-ol-enkephalin