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Which of the following is not a derivative of the amino acid (Tryptophan)?

Posted by: Pdfprep Category: USMLE Tags: , , Post Date: November 2, 2020

Which of the following is not a derivative of the amino acid (Tryptophan)?
A . Melatonin
B . Serotonin
C . Creatine
D . Niacin

Answer: C

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