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LDIR induced apoptosis were less than 10% at day 7. A LDIR induced apoptosis of hMSCS were measured by TUNEL assay. B The graphs presented LDIR induced apoptosis at day 7 two times or three times irradiated hMSCs (n = 3). (*p < 0.05, ** p < 0.01, and *** p < 0.001)
