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se·ro·to·nin

n :  a phenolic amine neurotransmitter C10H12N2O that is a powerful vasoconstrictor and is found esp. in the brain, blood serum, and gastric mucous membrane of mammals - called also 5-HT 5-hydroxytryptamine  .
 
   

 
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Hamlin Memorial Hospital (Hamlin, Texas - Jones County)