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LDIR did not induce DNA damage response in hMSCs. A Morphologies after two or three times LDIR irradiated hMSCs. LDIR irradiated hMSCs increased cell density. 3 Gy irradiated hMSCs showed senescence morphology (white arrow). B Expressions of γ-H2AX foci. C Numbers of γ-H2AX foci per two or three times 3 Gy irradiated hMSCs. D Sizes of nuclei of LDIR irradiated hMSCs. More than twenty nuclei in Fig. 4B were analyzed by ImageJ. (*** p < 0.001)
