close intra-arterial injection to the pylorus of dynorphin- ( 1-13 ) ( dyn ) for kappa-receptors , [ d-pen2,5 ] enkephalin ( dpen2,5-enk ) for delta-receptors , and [ n-me-phe3-d-pro4 ] morphiceptin ( pl017 ) and [ d-ala2 , n-me-phe4 , gly5-ol ] enkephalin ( dago ) for mu-receptors showed no excitatory effect in the pylorus .
C0014298
enkephalin
C0525773
dago