title: beta-Endorphin: structure-activity relationships in the guinea pig ileum and opiate receptor binding assays.
mesh_terms: D000818:Animals; D001681:Biological Assay; D002162:Camelus; D002268:Carboxypeptidases; D006168:Guinea Pigs; D006801:Humans; D007082:Ileum / Q000187:drug effects; D007931:Leucyl Aminopeptidase; D009294:Narcotics; D010446:Peptide Fragments / Q000032:analysis; D010455:Peptides / Q000378:metabolism* / Q000494:pharmacology; D011957:Receptors, Opioid / Q000378:metabolism*; D013329:Structure-Activity Relationship; D014357:Trypsin
chemical_list: D009294:Narcotics; D010446:Peptide Fragments; D010455:Peptides; D011957:Receptors, Opioid; D002268:Carboxypeptidases; D007931:Leucyl Aminopeptidase; D014357:Trypsin