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Serotonin

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

Updated: February 2, 2008

About.com Health's Disease and Condition content is reviewed by our Medical Review Board

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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