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Figure 2: Effect of puerarin on apoptosis of hOBs measured by TUNEL assay. Cells were exposed to 10−8 M puerarin for 48 h, while the control group was incubated with serum-free medium for 48 h. Apoptotic nuclei were detected by TdT-mediated dUTP nick end-labeling (TUNEL). Arrows show apoptotic cells. Original magnification 100.