Definition: Serotonin is a neurotransmitter, or a chemical messenger that helps to relay messages from one brain cell to another. It is involved in sleep, appetite, sex as well as mood and anxiety modulation.
Serotonin - What is Serotonin
By Keath Low, About.com
Updated: August 14, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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