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Suppression of representation exo1-dependent mutator mutations by increased expression of PCNA. The indicated strains were transformed with either the control vector or the vector containing the POL30 gene encoding PCNA. Then, three colonies each were patched onto a master plate and replica plated onto an SD-Lys plate to evaluate the lys2::InsE-A10 reversion properties of each strain as described in Materials and Methods.
