(a) Formation of 5-FodU, 5-HmdU, and 8-oxodG under different oxidation conditions. (b) Formation of d(G^T) under different oxidation conditions. The data represent mean ± SD from three independent experiments. No Cu2+: 400 μM H2O2 and 4 mM ascorbate; No ascorbate: 400 μM H2O2 and 50 μM Cu2+; with DMSO: 400 μM H2O2, 50 μM Cu2+, 4 mM ascorbate and 8 mM DMSO; without DMSO: 400 μM H2O2, 50 μM Cu2+ and 4 mM ascorbate.