2615759 MEAGL Met5-enkephalin-Arg6-Gly7-Leu8 15 926400 ENK methionine-enkephalin-Arg6-Gly7-Leu8 6 2648893 Enk-8 enkephalin-Arg6-Gly7-Leu8 6 2658338 MERGL Met-enkephalin-Arg6-Gly7-Leu8 6 3858056 Met-Enk-Arg-Gly-Leu Met-enkephalin-Arg6-Gly7-Leu8 6 3034752 Met-8 Met-enkephalin-Arg6-Gly7-Leu8 4 2991590 Met-Enk-8 Met-enkephalin-Arg6-Gly7-Leu8 2 2245529 Met-ENK-Arg6-Gly7-Leu8 Met-enkephalin-Arg6-Gly7-Leu8 1 1228864 mE8 Met-enkephalin-Arg6-Gly7-Leu8 1 2648880 mENK8 Met-enkephalin-Arg6-Gly7-Leu8 1