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Serotonin

By Barbara Bradley Bolen, Ph.D., About.com

Updated February 02, 2008

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Definition: A particular type of neurotransmitter (chemical within the nervous system) that is thought to play a role in mood, sleep, sexual functioning and appetite.

In-depth coverage of the role of serotonin in irritable bowel syndrome:

Also Known As: 5-HT
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