title: Selective ligands for opioid receptors. beta-Cyclopropylalanyl containing analogs of enkephalin.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001681:Biological Assay; D004745:Enkephalins / Q000138:chemical synthesis* / Q000378:metabolism / Q000494:pharmacology; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D007202:Indicators and Reagents; D008024:Ligands; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D051381:Rats; D011957:Receptors, Opioid / Q000378:metabolism*; D013329:Structure-Activity Relationship; D014649:Vas Deferens / Q000187:drug effects
chemical_list: D004745:Enkephalins; D007202:Indicators and Reagents; D008024:Ligands; D011957:Receptors, Opioid