Nucleotide Excision Repair
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Nucleotide excision repair removes a damaged DNA stretch, such as one from ultraviolet light, and resynthesizes it from the intact complementary strand.
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UV damage that distorts the helix is cut out on both sides, and DNA polymerase and ligase fill and seal the gap.
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This pathway repairs damage from an external source such as UV — mismatch repair already handles replication errors.