Assertion: tryptophan | /r/HasProperty | required for normal growth
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Source sentences:
text: Tryptophan is an essential amino acid required for normal growth and it serves as an in vivo precursor for several bioactive compounds including nicotinamide (vitamin B 6 ), serotonin, melatonin, tryptamine, kynurenine, 3-hydroxykynurenine, and quinolinic and xanthurenic acids ( Figure 1 ).