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Proliferation of hNSCs and A172 cells irradiated with X-rays or carbon-ion (C-ion) beams. The number of cells was counted every 24 h after irradiation and is shown after normalization to the number of non-irradiated controls at 0 h. (A) hNSCs irradiated with X-rays. (B) hNSCs irradiated with C-ion beams. (C) A172 cells irradiated with X-rays. (D) A172 cells irradiated with C-ion beams. *P < 0.05, **P < 0.01, and ***P < 0.001 compared with the corresponding control.
