this study evaluated the interaction of the analgesic effects of a selective kappa- ( u50 , 488h ) and a selective delta- ( [ d-pen2,5 ] enkephalin , dpdpe ) opioid agonist , co-injected intrathecally , using the randall-selitto paw-withdrawal test , in the rat .
C0014298
enkephalin
C0525856
dpdpe