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(A) TUNEL staining reflects apoptotic cells (400 ×); (B) AI of femoral tissues; *, P < 0.05 vs. the sham group, #, P < 0.05 vs. the OP group; ALN, alendronate; OP, osteoporosis; TUNEL, TdT-mediated dUTP-biotin nick end-labeling assay; AI, apoptosis index.
