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Serotonin (5-hydroxytryptamine, or 5-HT) is a monoamine neurotransmitter synthesised in serotonergic neurons in the central nervous system and enterochromaffin cells in the gastrointestinal tract.

Note:   The above text is excerpted from the Wikipedia article "Serotonin", which has been released under the GNU Free Documentation License.
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October 6, 2015

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updated 12:56 pm ET