After decalcification, DNA strand breaks were detected using a TdT‐mediated dUTP nick end labelling staining kit (Roche, Nutley, NJ). Cell proliferation was detected using the Ki67 antibody (Abcam, Cambridge, UK), and the nuclei were stained with 4′,6‐diamidino‐2‐phenylindole. Images were captured using the IX 70 fluorescence microscope (Olympus).
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