title: Opiate receptor affinity of peptides related to Leu-enkephalin.
mesh_terms: D000818:Animals; D001665:Binding Sites; D001921:Brain / Q000378:metabolism; D009294:Narcotics / Q000378:metabolism*; D009842:Oligopeptides / Q000378:metabolism*; D011485:Protein Binding; D051381:Rats; D011955:Receptors, Drug; D013329:Structure-Activity Relationship; D013570:Synaptic Membranes / Q000378:metabolism
chemical_list: D009294:Narcotics; D009842:Oligopeptides; D011955:Receptors, Drug