Files in this Data Supplement:

• Supplemental file 1 - Supplemental text; Tables S1 (Breeding schemes to generate Nbs1^ΔB/ΔB Prkdc^scid/scid double mutants), S2 (Analysis of plasmid end joining), and S3 (DAPI banding analysis of chromosome fusions); and Fig. S1 (Analysis of chromosomal aberrations in primary MEFs), S2 and S3 (Growth analysis [S2] and survival [S3] of ear fibroblasts), S4 (End joining capacity of cell cultures), S5 and S6 (Analysis of the G₁/S [S5] and G₂/M [S6] checkpoints), and S7 (Cyclin B-associated kinase activity).
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