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Selected-ion chromatograms for the monitoring of the m/z 742.1 → 1154.1 (a, for unlabeled 8-MOP-ICL-containing tetranucleotide) and 742.1 → 1157.1 (b, for labeled 8-MOP-ICL-containing tetranucleotide) transitions of the digestion mixtures of the cellular DNA samples, which were extracted from WM-266-4 cells treated with 500 ng/mL 8-MOP and 2.0 J/cm2 UVA light.
