Human Metabolome Database (HMDB): (±)-Tryptophan is a dietary supplement, nutrient.Tryptophan is one of the 20 standard amino acids, as well as an essential amino acid in the human diet. Only the L-stereoisomer of tryptophan is used in structural or enzyme proteins, but the D-stereoisomer is occasionally found in naturally produced peptides (for example, the marine venom peptide contryphan). (Wikipedia
External links: hmdb.cakegg.jpebi.ac.ukpubchem.ncbi.nlm.nih.gov
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