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Comparison of the 3′–5′ exonuclease activities of the mutants assayed using manganese as the cofactor. The substrate used was a 8/25mer recess-ended dsDNA. (A) Gel profile of the exonuclease products using the protein samples. The reaction time was 30 min. (B) Quantification of the exonuclease activities of the wild-type PolD and the mutants. Each value was calculated based on the results of at least three independent reactions.
