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en•keph•al•in



Pronunciation: (en-kef'u-lin), [key]
n. Biochem.
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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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