noun (sometimes lowercase)

  1. See under enkephalin.

noun Biochemistry.

  1. either of two pentapeptides that bind to morphine receptors in the central nervous system and have opioid properties of relatively short duration; one pentapeptide (Met enkephalin) has the amino acid sequence Tyr-Gly-Gly-Phe-Met and the other (Leu enkephalin) has the sequence Tyr-Gly-Gly-Phe-Leu.


  1. a chemical occurring in the brain, having effects similar to those of morphineSee also endorphin


  1. An enkephalin that has a terminal methionine residue and occurs naturally as one of two such pentapeptides that are formed in the brain.


  1. Either of two closely related pentapeptides having opiate qualities and occurring especially in the brain and spinal cord.

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