metenkephalin

== English == === Alternative forms === met-enkephalin === Etymology === From Met +‎ enkephalin. === Noun === metenkephalin (uncountable) (biochemistry) An endogenous opioid peptide neurotransmitter found naturally in many parts of the animal and human body; one of the two forms of enkephalin (the other being leuenkephalin) ==== Synonyms ==== OGF, opioid growth factor