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Figures a, b, c and d: Frequency of DMC monoadduct 2b and of the sum of adducts (2b + 2a) formed under bifunctional conditions with various oligonucleotides. The central sequence of each oligonucleotide is indicated on each horizontal axis: (a) oligonucleotides 14, 15, 16, 17; GpC step (b) oligonucleotides 18, 19, 20, 21; GpT step (c) oligonucleotides 22, 23, 24, 25; GpA step (d) oligononucleotides 26, 27, 28, 29; GpG step
