Contrasting results on enhanced DNA strand break repair in CD133+ cells. Contrasting results on enhanced DNA strand break repair in CD133+ cells. A. CD133+

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Contrasting results on enhanced DNA strand break repair in CD133+ cells. Contrasting results on enhanced DNA strand break repair in CD133+ cells. A. CD133+ and CD133− cells derived from primary glioblastoma T3539 were irradiated with 3 Gy of IR. The presence of DNA damage at sequential time points after damage was assessed by single-cell gel electrophoresis assay under alkaline conditions (alkaline comet assay). The histogram quantitates the percentages of cells with comet tails at different time points after IR in CD133+ (open bars) and CD133− (solid bars) populations. Data are the means ± standard deviation (SD; *, P = 0.001; **, P = 0.002; reprinted by permission from Macmillan Publishers Ltd: Nature 444:756–60, 2006). B. CD133+ and CD133− derived from primary glioblastoma COMI were separated and plated. Sixteen hours later adherent cells were irradiated with 3 Gy IR and DNA strand break repair assessed by measuring the percentages of DNA in comets' tails under alkaline conditions. The histogram quantitates the percentages of DNA in comet tails at different time points after IR in CD133+ (open bars) and CD133− (solid bars) populations. Data are the means ± SEM (Reprinted by permission from the American Association for Cancer Research: Mol Cancer Res 7:383–92, 2009). Guido Frosina Mol Cancer Res 2009;7:989-999 ©2009 by American Association for Cancer Research