Figure 1: Relationship between the percentages of senescence-associated β-galactosidase (SA-β-gal)- positive cells, p21-expressing cells, and p16- expressing cells measured in 4 human cancer cell lines at seven days after exposure to an 8-Gy dose of 60Co γ radiation. All values for irradiated cultures were corrected by subtracting those for sham-irradiated control cultures. Bars, SE. Adapted from Mirzayans et al. [27].