Epistatic analyses of mms2 with radiation repair pathway mutations with respect to UV sensitivity. (A–D) □, DBY747 (wt); ▪, SBU (mms2). (A) mms2 and rad6. ○, WXY9376 (rad6Δ); •, SBU6L (rad6Δ mms2). (B) mms2 and rad18Δ. ○, WXY9326 (rad18Δ); •, SBU18T (rad18Δ mms2). (C) mms2 and rad4Δ. ○, WXY9394 (rad4Δ); •, SBL4U (rad4Δ mms2). (D) mms2 and rad50Δ. ○, WXY9579 (rad50Δ); •, SBU50h (rad50Δ mms2). The results are an average of two to four independent experiments.