ART558-mediated radiosensitization under hypoxic conditions. A, Clonogenic survival of H460 cells irradiated upon hypoxia (0.5% and <0.1% oxygen). For OERs, see Supplementary Fig. S4. The 6 Gy data points are replotted in a bar graph in B to allow better visual comparison between the different treatment arms (*, P < 0.05; **, P < 0.01; ***, P < 0.001; ****, P < 0.0001).