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Immunohistochemical expression of apurinic/apyrimidinic endonuclease 1 (APE1), transforming growth factor β1 (TGFβ1), and CD34 in a xenograft mouse model (magnification, ×200). (a) Left, high expression of APE1, TGFβ, and CD34 in mice from the control group. Right, low expression of APE1, TGFβ, and CD34 of mice in the APE1-siRNA group. (b) Microvessel density of control and APE1-siRNA groups. **P < 0.01.
