PAEC were transfected cDNA encoding with GFP (panels a-d), GFP-conjugated wild type (wt) p190 (panels e-h), or GFP-conjugated dominant negative (dn) p190 (panels i-l). At 48h post-transfection, endothelial cells were fixed and immunofluorescently stained for vinculin using Texas Red-conjugated secondary antibodies directed against vinculin antibodies (panels d, h, l) or filamentous actin using Texas Red-conjugated phalloidin (panels c, g, k). Nuclei were counterstained using DAPI. Endothelial cells were visualized via fluorescence microscopy. Arrows indicate representative transfected endothelial cells. Images are representative of three independent experiments and 6−9 images were obtained for each experiment. Scale bars = 20μm. Panel m, number of focal adhesions per endothelial cell was quantitated as the number of immunofluorescently stained vinculin structures relative to total number of transfected endothelial cells for each construct. Data is presented as the mean ± SEM. n = 3; * p<0.05 vs. GFP or GFP-DN p190.