Bovine adrenal chromaffin granules have been shown to contain, in addition to Met-enkephalin and Leu-enkephalin, at least three small peptides with opiate receptor activity. One of these adrenal peptides has been purified to homogeneity and its sequence was shown to be Met-enkephalin-[Arg 6,Phe 7]. This heptapeptide was also found in beef striatal extracts in amounts comparable to those of Leu-enkephalin.