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Typical chromatograms of the selected biomarkers extracted from the analysis of spiked urine sample. Note: Spiking concentrations were 73 nmol/L for 8OHdG and m-Tyr, 182 nmol/L for 2-dG, o-Tyr, 3NO2-Tyr and 3Cl-Tyr and 23 mM for p-Tyr and Phe. Image from Kuligowski et al. PloS One 2014, 9: e93703 [48], reproduced under the creative commons license.
