Which of the following statements about tryptophan is incorrect?

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It is a non-essential amino acidIt plays a role in the production of serotoninIt contributes to the synthesis of niacinIt is involved in the formation of melatonin

Explanation

Tryptophan is an essential amino acid, meaning it must be obtained through the diet. It serves as a precursor for important compounds such as serotonin, niacin (vitamin B3), and melatonin. Therefore, the statement that it is non-essential is false.