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Integrated optical density values obtained in the MTT assay prior to and following siRNA treatment in the TNM1–2 and TNM3–4 cells. Results are expressed as the mean ± standard deviation (n=5). *P<0.05 and **P<0.01, vs. TNM(1–2) + siRNA; #P<0.05 and ##P<0.01, vs. TNM(3–4) + siRNA. TNM, tumor-node-metastasis; siRNA, short interfering RNA.
