A) Representative karyotypes of independent HeLa clones after exposure to MMC [60nM]. Chromosomal breaks, gaps, radials (red arrows) and acentric fragments (yellow arrows) were observed in −/−, A349P/-, P47A/- and D791V/−. The average number of breaks/gaps, radial formations and acentric fragments per metaphase spread were calculated for each genotype (n=15 spreads per cell line). Statistical significance determined by two way ANOVA with a Bonferroni posttest to BRIP1+/+ (*** p<0.0001). B) Overlay of representative cell cycles from independent HeLa clones with and without MMC treatment. Statistical significance calculated by averaging percentage of cells in G2/M from 3 replicates (one-way ANOVA with Tukey’s multiple comparison test).