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. 2008 Nov 28;37(2):336–345. doi: 10.1093/nar/gkn946

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© 2008 The Author(s)

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Tandem mass spectra supporting the formation of N3-CMdT and O⁴-CMdT in calf thymus DNA. Shown are the MS³ results, which monitors the further fragmentation of the protonated carboxymethylthymine (m/z 185), for: (a) standard N3-CMdT; (b) standard O⁴-CMdT; (c) the 27.8 min fraction shown in Figure 1c; and (d) the 29.2 min fraction shown in Figure 1c. Depicted in the insets are the corresponding MS/MS for the [M + H]⁺ ions of the modified nucleosides. The ion of m/z 185 found in MS/MS is attributed the elimination of a 2-deoxyribose.