the effect of the opioid peptides [ met5 ] enkephalin-arg6-phe7 ( meap ) and [ met5 ] enkephalin-arg6-gly7-leu8 ( meagl ) were compared with those of [ leu5 ] enkephalin and [ d-ala2 , met5 ] enkephalinamide ( dame ) on cholinergic neurotransmission in the rabbit isolated atria .
C0205753
opioid peptides
C0014298
enkephalin