a, Quantification of RPA positive alpha tracks in KB1P-B11 cells 1h or 2h after irradiation with alpha particles. b, Quantification of RPA and 53BP1-positive alpha tracks in KB1P-B11 cells transfected with non-targeting control siRNAs or siRNAs against CtIP. c, Cell cycle analysis (BrdU incorporation and propidium iodine labeling) of KB1P-B11 cells transduced with the indicated constructs and siRNAs. . d, e, Quantification of Rev7 transcript (d) or protein (e) levels in BRCA1-deficient mES cells transduced with Rev7-targeting shRNAs or the vector control. Hprt was used as a control for transcript expression. The data represent the mean ± SD. f, Representative images of surviving colonies of Brca1−/− mES cells transduced with an empty vector control or Rev7-targeting shRNAs. g, Quantification of colony formation normalized to the vector control. h, Quantification of RAD51 foci in Brca1−/− mES cells that were transduced with the indicated constructs.