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REV1 activity on DNA containing the AP site. Primer extension reactions were carried out in the presence of the wild-type REV1 protein (WT) or its catalytically inactive variant (CD) and all four dNTPs (N) or individual nucleotide substrates (A—dATP, G—dGTP, T—dTTP and C—dCTP); “–”—control reactions without dNTPs. The mean values of primer extension and standard errors are indicated.
