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MRM chromatograms of a naturally contaminated human urine sample. Blue line: quantifier transition. Red line: qualifier transition (for details see Table S1, Supplementary Material). Calculated concentrations: AFM1 < LOQ, CIT 0.99 ng/mL, DH-CIT 0.30 ng/mL, FB1 4.6 ng/mL, ZEN 0.27 ng/mL, α-ZEL < LOQ.
