Research Article

Role of Topoisomerase II in DNA Damage Response following IR and Etoposide

Figure 2

𝛾 H2AX foci formed in response to increasing doses of etoposide. WT and TOP2 𝛽 / MEFs were exposed to 0.1, 1, 10, and 100  𝜇 M etoposide for 2 hours and then assayed for 𝛾 H2AX foci. (a) Histograms of foci number ± SEM at each dose counted. 100  𝜇 M was not counted as foci were not distinct at this dose. Data derived from one experiment. (b) Representative images of 𝛾 H2AX foci (red) in nuclei stained with DAPI (blue) in WT and TOP2 𝛽 / MEFs.
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