enkephalin

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enkephalin

 [en-kef´ah-lin]
either of two pentapeptides, composed of four identical amino acids and either leucine or methionine, referred to as leu-enkephalin and met-enkephalin. The enkephalins function as neurotransmitters or neuromodulators at many locations in the brain and spinal cord and are involved with pain perception, movement, mood, behavior, and neuroendocrine regulation; they are also found in nerve plexuses and exocrine glands of the gastrointestinal tract.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

enkephalin

(ĕn-kĕf′ə-lĭn)
n.
Either of two closely related pentapeptides having opiate qualities and occurring in the brain, spinal cord, and other parts of the body.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
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