contractions were inhibited by alternate submaximal but equieffective doses of the selective mu and delta-opioid ligands [ d-ala2-me-phe4 , gly ( ol ) 5 ] enkephaline ( dago ) and [ 2-d-penicillamine , 5-d-penicillamine ] enkephalin ( dpdpe ) , respectively , administered by the intracerebroventricular ( i.c.v . ) or spinal intrathecal ( i.t . ) route .
C0014298
enkephalin
C0525856
dpdpe