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Meaning of serotonin

ser•o•to•nin

Pronunciation: (ser"u-tō'nin, sēr"-), [key]
— n. Biochem.
  1. a neurotransmitter, derived from tryptophan, that is involved in sleep, depression, memory, and other neurological processes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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