Figure 2
From: Evaluation of the fullerene compound DF-1 as a radiation protector
The effects of the timing of DF-1 treatment on cellular radiosensitivity. DU145 cells were exposed to DF-1 at 100 μM or vehicle control at the indicated times in relation to irradiation with graded doses of X-rays. Colony-forming efficiency was determined 10 to 14 days later and survival curves generated after normalizing for toxicity with DF-1 alone. The data represent the mean of three independent experiments. DMF, dose modifying factor. Points, mean; bars, ± SE.