DNA damage sensitivity of rad50-d cells is suppressed by deletion of pku70+. The sensitivities to γ rays, HU, MMS, and UV light of rad50-d cells and rad50 pku70 double mutants. The percent survival of wild-type cells, JY741 (•), rad50-d, KT002 (▴), and rad50 pku70 double mutants, KT152 (▵) is plotted against the dose of γ rays (A) or UV light (B) or is plotted against time in 0.02% MMS (C) or 20 mM HU (D). Standard deviations are shown by error bars.