TUNEL staining was performed to detect osteocyte apoptosis (12156792910, Roche, Basel, Switzerland). The percentages of TUNEL-positive cells in osteocytes relative to 4′,6-diamidino-2-phenylindole (DAPI)-stained cells were calculated, and an analysis was conducted using a Leica immunofluorescence system (Leica Microsystems, Wetzlar, Germany). Photographs from three independent experiments were taken for each experimental group [25,32].
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