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Single- and multi-base (loop) mismatches can arise in DNA by replication errors, during recombination, and by chemical modification of DNA. Single-base and loop mismatches of several nucleotides are efficiently repaired in mammalian cells by a nick-directed, MSH2-dependent mechanism. Larger loop mismatches (>=12 bases) are repaired by an MSH2-independent mechanism. Prior studies have shown that...
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