Met-enkephaline -----YGGFM
Leu-enképhaline------YGGFL
Heptapeptide---------YGGFMRF
Octopeptide----------YGGFMRGL
Bêta-endorphine------YGGFMTSEKSETPLVTLFKNAIIKNAHKKGQ
----------------------- |------ |------- -|------- |-------- |-------|---------|
-----------------------1------5-------10------15------
20-----30------
35