both delta selective peptides , [ d-ala2 , d-leu5 ] -enkephalin , met-enkephalin and leu-enkephalin , and preferential kappa ligands , dynorphin1-13 and ethylketocyclazocine , significantly reduced the vasoconstriction evoked by 8 pulses at 8 hz .
C0014298
enkephalin
C0014295
met-enkephalin