relative binding potencies derived from ki values for binding-inhibition studies of [ 3h ] etorphine with opioid peptides and opiates were : nil , etorphine-hcl greater than dynorphin a greater than naloxone-hcl greater than dynorphin- ( 1-9 ) greater than beta-endorphin much greater than alpha-neoendorphin approximately ( leu5 ) enkephalin approximately dago ( tyr-d-ala-gly-nme-phe-gly-ol ) ;
C0205753
opioid peptides
C0014298
enkephalin