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(A) Structure of EFdA. (B) DNA oligonucleotides used in the experiments. Shown are the D21 primer (radiolabeled, as indicated by an asterisk) and the D36 template. The primer “X” is the site of incorporation of the incoming dATP or EFdA-TP used in the single-nucleotide incorporation experiments or the location of the EFdA-MP to be removed in the excision studies.
