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Soft agar colony formation efficiency of HTori-3 cells irradiated with γ -rays and treated with SeM. HTori-3 cells were treated as described in the legend for Fig. 3. After the radiation exposure and SeM treatment, the cells were cultured in control medium for an additional 6 wk and were then used for the soft agar colony formation assay. Each data point represents a mean of 6 replicate flasks. The standard deviation is indicated by the error bars.
