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Gamma-ray irradiation ablated hippocampal neurogenesis. (A) Each image shows the dentate gyrus of sham (upper) and gamma-ray irradiated (lower) mice. Proliferating cells were stained with BrdU (red). Nuclei were counterstained with DAPI (blue). Scale bar, 100 μm. (B) Total number of BrdU+ cells in dentate gyrus of sham, 10 Gy-, 15 Gy- and 20 Gy-irradiated mice. **, p < 0.01 compared with sham; *, p < 0.05 compared with 10 Gy.
