the possibility that the delta agonist , [ d-pen2 , d-pen5 ] enkephalin ( dpdpe ) and the putative endogenous kappa agonist , dynorphin a- ( 1-17 ) could differentially modulate the effects of a group of chemically diverse mu agonists was evaluated using inhibition of volume-induced contractions of the rat urinary bladder as a model of central nervous system opioid receptor function in vivo .
C0014298
enkephalin
C0525856
dpdpe