intrathecal administration ( 1 , 3 or 10 micrograms ) of the proposed selective delta opioid agonist peptides , d-ala2-d-leu5-enkephalin , d-pen2-l-cys5-enkephalin or i.t . administration of d-ser2-leu-enkephalin- ( thr6 ) ( 10 micrograms ) were effective in inhibiting gastrointestinal transit .
C0205753
opioid
C0014298
enkephalin