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Influence of astrocytes on radiation-induced γH2AX foci. Radiation was delivered 48 h after coculture initiation to glioblastoma stem-like cells alone (monoculture) or in coculture. (A) γH2AX foci/cell at 1 h as a function radiation dose. (B) Percentage of cells with γH2AX foci above unirradiated controls remaining at 24 h after irradiation. Values shown represent the mean ± SEM for three to four independent experiments. *P < 0.05.
