The cells were fixed and permeabilized as previously depicted.25 (link) Vinculin, the adhesion protein, was labelled with mouse monoclonal anti-vinculin primary antibody (1:200, Sigma, USA) and conjugated anti-Mouse IgG Secondary Antibody (1:1000, Invitrogen, USA). To label the F-actin structure, the samples were stained with phalloidin (Molecular Probes, USA) with cell nuclei visualized by incubation with l DAPI (5 μg/m, Dojindo, USA). Slides were then imaged with a fluorescence microscope (SP5, Leica, Germany) with x63 objective.