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Increased sensitivity of cells devoid of SbcCD or SbcCD and PolXDr proteins in early exponentially growing cultures. Bacterial strains GY9613 (wild type, squares), GY12910 (ΔsbcCD, circles), GY12918 (ΔsbcCD ΔpolXDr, diamonds), and GY12219 (ΔpolXDr, triangles) grown to an A650 of 2 (panel A) or an A650 of 0.5 (panel B) were exposed to γ-irradiation at doses indicated on the abscissa, and cell survival was measured as described in Materials and Methods.
