Before revision:  We demonstrate that , irrespectively of the cell type, the shape of the cell edge between focal adhesions is accurately described by elliptical arcs, whose eccentricity expresses the ratio between directed and isotropic stresses.
After revision:  We demonstrate that , irrespectively of the cell type, the shape of the cell edge is accurately described by elliptical arcs, whose eccentricity expresses the ratio between directed and isotropic stresses.