the relative importance of three enzymes , amastatin-sensitive aminopeptidase , captopril-sensitive peptidyl dipeptidase a and phosphoramidon-sensitive endopeptidase-24.11 , to inactivate two opioid peptides , [ met5 ] -enkephalin and [ met5 ] -enkephalin-arg6 , was investigated in three in vitro isolated preparations , guinea-pig ileum , mouse vas deferens and rat vas deferens , by estimating the magnitude of the enhancement of the inhibitory potency of the opioid peptide by each peptidase inhibitor .
C0014298
enkephalin
C0205753
opioid peptide