Interaction of iodinated enkephalin analogues with opiate receptors.

Animals Brain/metabolism Cells, Cultured Endorphins/metabolism Enkephalins/metabolism Guinea Pigs In Vitro Techniques Iodine Radioisotopes Isotope Labeling Manganese/pharmacology Mice Muscle Contraction/drug effects Protein Binding Rats Receptors, Opioid/metabolism Sodium/pharmacology

Endorphins Enkephalins Iodine Radioisotopes Receptors, Opioid Manganese Sodium