Selley, D E Cation requirement for GTP regulation of [125I]b-endorphin binding to Mu and sigma opioid receptors. [electronic resource] - NIDA research monograph 1989 - 537-8 p. digital Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S. ISSN: 1046-9516 Subjects--Topical Terms: AnimalsBinding, Competitive--physiologyBrain--metabolismGuanosine Triphosphate--physiologyRatsReceptors, Opioid--metabolismReceptors, Opioid, muReceptors, sigmaSodium--physiologySynaptic Membranes--metabolismbeta-Endorphin--metabolism