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The toolkit facilitates the analysis of non-protein amino acids, indicating their diversity is underexplored.
Non-protein amino acids (npAAs) are metabolites with amine (NH 2 ) and carboxyl (COOH) moieties. Their natural diversity is not well understood. We created an analytical toolkit including SOPs, statistical methods and a searchable database of 332,154 metabolites for future studies of npAA.
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Sandhu et al. (2026) studied this question.
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