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Of course, a more complex version of the sentence is "The damaged base is removed by a DNA glycosylase, resynthesized by a DNA polymerase, and a DNA ligase performs the final nick-sealing step".<unk> Of course, a more complex version of the sentence is "The damaged base is removed by a DNA glycosylase, resynthesized by a DNA polymerase, and a DNA ligase performs the final nick-sealing step".<unk>