in the structures studied , the concentrations of enkephalins expressed as femtomole/mg of wet tissue ranged from 66 to 160 with met-enkephalin , from 15 to 45 with leu-enkephalin and from 2 to 12 for met-enkephalin-arg-gly-leu .
C0014298
enkephalins
C0014294
leu-enkephalin