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Positive ion spectra of 8-methyl and N2-methyl-2’ deoxyguanosine derived from C8-D-dG (Panel A), and from normal dG with H at the C8 position, after proton exchange with D2O (Panel B). The spectra were recorded using 10 mM ammonium formate in H2O/CH3CN = 1 : 1 v/v mixtures (Panel A), and 10 mM ammonium formate in D2O/CH3CN 1 : 1 v/v (Panel B) mobile phases, respectively. The panels show the aglycone ions derived from the detachment of the sugar residues from the molecular ions.
