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Stable SCC9 cells expressing MT1-MMP (SCC9-M) possessed the ability of more resistant to apoptosis. (A and B) The flow cytometric apoptosis analysis for stable SCC9 cells expressing an empty vector (SCC9-N) and SCC9-M cells under two concentrations of mitomycin. (C) The statistic analysis of the rate of cell apoptosis for the SCC9-N and SCC9-M cells. Each bar represents the mean ± s.d. **P<0.01.
