Dictionary![]() ![]() ser•o•to•ninPronunciation: (ser"u-tō'nin, sēr"-), [key] —n. Biochem. 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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