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Ki-67 immunostaining for cell proliferation. A) Quantitative analysis of cell proliferation in all groups at 21 d expressed as the number of cells per square millimeter. Data are presented as means ± sem; n = 4. B) Representative images at 21 d of denuded CCA in the saline and PEI+TSP-2 siRNA group. Proliferating cells are indicated with black arrows. Original magnification, ×400. Scale bars, 50 μm. *P < 0.05.
