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Selected-ion chromatograms (SICs) for the monitoring of the m/z 570 → 472 [a, for unlabeled d(G^T)] and 573 → 475 [b, for labeled d(G^T)] transitions in the Cu/H2O2/ascorbate-treated calf thymus DNA after enzymatic digestion. Shown in the insets are the product-ion spectra of the [M + H]+ ions of the unlabeled and labeled d(G^T).
