(B) UV-UDS, a measure of global genome repair. Number of experiments: n = 15 (XpdTTD/TTD), n = 6 (XpdTTD/KO), n = 4 (XpdTTD/†XPCS ), n = 2 (XpdTTD/†XP ); 1–2 cell lines per genotype were included in each experiment. The asterisk indicates significant difference with XpdTTD/TTD; crosses indicate significant differences with XpdTTD/KO.