title: Enkephalin analogs with enhanced opiate activity.
mesh_terms: D000818:Animals; D001681:Biological Assay; D001923:Brain Chemistry; D009294:Narcotics; D009842:Oligopeptides / Q000494:pharmacology; D051381:Rats; D013329:Structure-Activity Relationship
chemical_list: D009294:Narcotics; D009842:Oligopeptides