(f-h) Inverse invasion assay. An equal number of MDA-MB-231 cells was reverse transfected with a mixture of three individual siRNA oligonucleotides targeting interest genes. Invasive activity is shown as the average number of cells/field that migrate into fibronectin-supplemented (25 µg/ml) Matrigel further than 20 µm (f, g). Data are mean ± SD from three different fields from one representative experiments out of 5 that were performed. 