Either of two #0excludeGlossary compounds produced in the brain (#1excludeGlossary and Leu-enkephalin) that mimic the activity of morphine.
Merriam-Webster Online Dictionary
enkephalin (noun)either of two pentapeptides with opiate and analgesic activity that occur naturally especially in the brain and have a marked affinity for opiate receptors - compare endorphin
Endogenous morphine, Endogenous opioid, Neurochemical, Pain reliever, Painkiller
