Fig. 3.

Relative mRNA expression levels of 53BP1 in irradiated HeLa, MCF7, CNE-2 and HCT116 cells treated with fresh medium (FM) or harvested conditioned medium (CM) having previously conditioned the bystander cells (partnered with IRCs) that were incubated until 12 h post-irradiation. Data were analysed using Student’s t-test: two-sample assuming unequal variances. ^*P < 0.05, ^**P < 0.01 and error bars represent mean ± SD.