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UV survival based on colony-forming ability of revertants and parental cell lines. Cell lines tested were WT V79 (○), V-H1 (□), and the phenotypic revertants RH1-3 (⋄), RH1-26 (▵), and RH1-53 (▿). Lines intersecting the abscissa indicate data points below the axis. Each survival curve represents the average of two experiments. Error bars represent SEMs.
