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Relative mRNA expression levels of PARP1 in HeLa, MCF7, CNE-2 and HCT116 irradiated cells treated with harvested CM/CM + BAY5 having previously conditioned the bystander cells (partnered with IRCs) for 30 min, followed by the replacement of media with FM and incubation until 12 h post-irradiation. Data were analysed using Student’s t-test: two-sample assuming unequal variances. *P< 0.05 and error bars represent mean ± SD.
