(A) siRNA knockdowns in DIT7 cells. Frequencies of cell death are: vimentin, 47%; XPA-1, 55%; XPA-2, 63%; CSB-1, 52%; CSB-2, 51%; ERCC1-1, 61%; ERCC1-2, 53%; XPG-1, 51%; XPG-2, 57%. (B) siRNA knockdowns in DIT7-R103 cells. Frequencies of cell death are: vimentin, 22%; XPA-1, 33%; XPA-2, 31%; CSB-1, 29%; CSB-2, 26%; ERCC1-1, 39%; ERCC1-2, 31%; XPG-1, 25%; XPG-2, 40%. Frequency of cell death was calculated as the number of nonadherent cells divided by the sum of adherent and nonadherent cells. Data are the average frequencies of cell death from at least 6 independent siRNA knockdown experiments. Error bars indicate standard deviations. Statistical significance relative to the vimentin control is indicated: *P<0.05; **P<0.001; ***P<0.0001.