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Oligodeoxyribonucleotides with a 5′-TA*A-3′ or 5′-GA*C-3′ sequence (underlined) used in this study. X denotes A or 2-OH-Ade; N represents A, G, C or T. A particular duplex is indicated as sequence series name followed by X–N base pair as subscript, e.g. [1]A*T indicates 5′-GGAATATTAGCTGGT-3′/5′-ACCAGCTA*ATATTCC-3′.
