Fig. 5.

Results for bystander cells. (a) Fold changes in LysoTracker Red fluorescence intensities (normalized to that for the experimental control) of bystander HeLa cells (BY group and SBY group) cultured for 4 h in the medium having previously conditioned HeLa cells irradiated with 2 Gy X-ray. (n = 3) (b) Number of 53BP1 foci/cell nucleus in BY DMEM group and BY EBSS group of HeLa cells recorded at 4 h post irradiation. Independent experiments were performed in triplicates and repeated three times. *P < 0.05, **P < 0.01, and error bars represent ± SEM.