Serotonin

se·ro·to·nin   (sěr'ə-tō'nĭn, sîr'-)    n.  An organic compound, C10H12N2O, formed from tryptophan and found in animal and human tissue, especially the brain, blood serum, and gastric mucous membranes, and active as a neurotransmitter and in vasoconstriction, stimulation of the smooth muscles, and regulation of cyclic body processes. [sero- + ton(e) + -in.]

serotonin 

Main Entry: se·ro·to·nin
Pronunciation: "sir-&-'tO-n&n, "ser-
Function: noun
: a phenolic amine neurotransmitterC₁₀H₁₂N₂O that is a powerful vasoconstrictor and is found especially in the brain, blood serum, and gastric mucous membrane of mammals called also 5-HT,5-hydroxytryptamine

serotonin se·ro·to·nin (sěr'ə-tō'nĭn, sēr'-)
n.
An organic compound formed from tryptophan and found in animal and human tissue, especially the brain, blood serum, and gastric mucous membranes, and active in vasoconstriction, stimulation of the smooth muscles, transmission of impulses between nerve cells, and regulation of cyclic body processes. Also called 5-hydroxytryptamine.

serotonin   (sěr'ə-tō'nĭn, sîr'-)  Pronunciation Key  A monoamine substance that is formed from tryptophan and found in many animal tissues, including the intestine and central nervous system. In the brain, serotonin acts as a neurotransmitter that is involved in the control of pain perception, the sleep-wake cycle, and mood. Serotonin is also produced in some bacteria and plants.