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  • Tryptophan is one of the 22 standard amino acids and an essential amino acid in the human diet, as demonstrated by its growth effects on rats. It is encoded in the standard genetic code as the codon UGG. Only the L-stereoisomer of tryptophan is used in structural or enzyme proteins, but the R-stereoisomer is occasionally found in naturally produced peptides. The distinguishing structural characteristic of tryptophan is that it contains an indole functional group.

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Active ingredient of formulation
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Freebase Commons Chemistry /chemistry

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