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An extracted ion chromatogram (EIC) of free aromatic amino acids (FAAAs) in nail lysates; a novel report shows high abundance in healthy subjects and undetectable in breast cancer patients. Here, (A–C) represent a +ESI EIC of tryptophan (+ESI EIC 186.0788, 204.0893), phenylalanine (+ESI EIC 166.0863), and histidine (+ESI EIC 156.0768), respectively.
