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Regeneration and apoptosis of knee articular cartilage in rats. A Masson and Safranin O staining, and EDU, TUNEL (green), DAPI (blue) immunofluorescence staining of rat knee cartilage in the different groups. The region between the white dotted lines is the cartilage layer (CL). Bar = 100 μm, n = 3. B–D Statistical analysis of staining. E QPCR detection of cell cycle-related factors. *P < 0.05, **P < 0.01, ***P < 0.001, N = no statistical difference
