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. Author manuscript; available in PMC: 2014 Sep 16.
Published in final edited form as: Chem Res Toxicol. 2013 Sep 4;26(9):10.1021/tx400221w. doi: 10.1021/tx400221w

Figure 1.

Figure 1

Selected-ion chromatograms (SICs) for monitoring the m/z 250→164→136 [A, for unlabeled (5′S)-cdA] and m/z 255→169→141 [B, for uniformly 15N-labeled (5′S)-cdA] transitions in the Cu(II)/H2O2/ascorbate-treated calf thymus DNA after enzymatic digestion. Shown in the insets are the positive-ion MS3 spectra for the unlabeled and labeled (5′S)-cdA. The sample was treated under Conditions B listed in Table 1.