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(A)Fluorescent staining images of live/dead cells after incubation for 4 and 7 days in different groups. Scale bar: 200 μm. (B) Typical images of cell apoptosis detected with Annexin V-FITC/PI double-staining using flow cytometer. Statistical analysis of dead cells percentage (C) and apoptotic rate (D) in all the groups. *p < 0.05 vs. pTi, #p < 0.05 vs. BaTiO3/pTi, +p < 0.05 vs. pTi + LIPUS.
