Biologically Active Substance
methionine enkephalin
me·thi·o·nine en·keph·al·in
Subclass of:
Enkephalins
Definitions related to methionine enkephalin:
  • (enkephalin, methionine) One of the endogenous pentapeptides with morphine-like activity. It differs from LEU-ENKEPHALIN by the amino acid METHIONINE in position 5. Its first four amino acid sequence is identical to the tetrapeptide sequence at the N-terminal of BETA-ENDORPHIN.
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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