in the bioassay ( inhibition of electrically induced contractions of the mouse vas deferens ) [ 1-o-methyltyrosine,5-methionine ] enkephalin , [ 1-n-methyltyrosine,5-methionine ] enkephalin , [ 4-tryptophan,5-methionine ] enkephalin , and [ 5-methionine sulfoxide ] enkephalin possess , respectively , 0.4 , 21 , 27 , and 67 % activity of [ 5-methionine ] enkephalin .
C0014298
enkephalin
C0014295
5-methionine ] enkephalin