Figures 4: A-D show the response of the three lymphoblastoid cell lines with mono-allelic mutations in the BRCA2 gene to increasing doses of gamma radiation in the presence and absence of 5 μM Olaparib. The GM14170 cells line is shown in Figure 4A, GM14622 in Figure 4B and GM14805 in Figure 4C. Figure 4D combines the three responses into a survival curve. Broken lines show the response of the cells to gamma radiation alone while the unbroken line shows the response to gamma radiation in the presence of Olaparib. Error bars represent standard error of the mean of at least three independent experiments.