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a Invasion of F4 and F5M2 cells with transwell chambers in vitro. Cells migrating to the lower surface of filters were stained with toluidine blue solution. Cells were counted from five fields per sample at ×200 and averaged. Bar 50 μm. b Values in the graph represent the average number of cells (mean ± SD). Compared with F5M2, the invasion capacity of F4 was significantly lower (p < 0.01)
