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Osteosarcoma 9901 cells transfected with apurinic/apyrimidinic endonuclease 1 (APE1)-siRNA, with the negative control as scramble control. (a) PCR images. (b, c) PCR reveals that APE1-siRNA suppresses expression of APE1 and transforming growth factor β1 (TGFβ1). **P < 0.01.
