Gap-repair efficiency and CO production in WT and helicase-deficient strains.

All strains were MMR-defective (mlh1Δ). Asterisks indicate a significant difference when compared to WT using a Student's t-test (p1Plasmid repair efficiency reflects the mean His+∶Leu+ ratio normalized to that obtained in the WT strain. N is number of independent transformations used to determine the mean.2Mean CO and NCO efficiencies were determined by multiplying the repair efficiency by the proportion of transformants that were categorized as CO and NCO events, respectively, based on plasmid stability.