Endothelial Tugging (IMAGE) University of Pennsylvania Caption Representative force vector plots of single (I) and paired (J) cells. Force vectors are plotted as arrows showing the direction of force and magnitude (arrow length; reference arrow for 10 nN shown above scale bar). Individual traction forces are shown in red and tugging force is shown in white Credit University of Pennsylvania Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.