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UV survival of the recB1067 recD mutant strain RIK151 (▪) and its ssExo-deficient derivatives DE1088 (RecB* RecD− RecJ−) (▴), DE1089 (RecB* RecD− RecJ− ExoI−) (•), and DE1090 (RecB* RecD− RecJ− ExoVII−) (▾); DE101 (♦) is a recB-deficient mutant. Fraction survival is given as a fraction of unirradiated culture. Each value is a mean of two independent experiments.
