Dictionary of Human Evolution and Biology

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Monoamine neurotransmitter found in the gastrointestinal mucosa (where it causes smooth muscle contraction), in blood platelets (secretion increases capillary permeability), and in the brain. Serotonin has different inhibitory roles in several parts of the brain, and serotonin concentrations have been reported to modify mood, appetite, memory, and learning ability. Aka 5-hydroxytryptamine, 5-HT.

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