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Invasion and migration assay. Representative images of transmigrated cells for (a) U87 ML and (b) U87 NS cells. (c,d) Percentage of invasiveness in U87 ML and NS cells evaluated 24 h after PEF-5 exposure and IR combined treatment. p values were determined using a two-tailed t test. * p < 0.05; ** p < 0.01; *** p < 0.001.
