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Nucleotide excision by WT-RT of primers containing 3′-end North nucleosides (A) and South nucleosides (B). Aliquots were taken at each time point (1, 5, 10, 20, 30, 45, 60, and 90 min, respectively). For the control experiment, aliquots were taken before mixing “ATP-mix” solutions, which were used as aliquots at 0 min.
