using the enkephalins as the prototypic delta ligands ( 100 fold selective ) and based on their effects on analgesia , we suggest that leu-enkephalin-like peptides interact with the delta receptor as an `` '' agonist '' '' to facilitate and met-enkephalin-like peptides as an `` '' antagonist '' '' to attenuate analgesia .
C0014298
enkephalins
C0014294
leu-enkephalin