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Tyrosine

By Kimberly Read & Marcia Purse, About.com Guide

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Definition:
Tyrosine is a non-essential amino acid. Tyrosine is a component or precursor of two of the neurotransmitters that affect mood, dopamine and norepinephrine, as well as epinephrine and melatonin.
Pronunciation: TY-roh-seen
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