Tension Gauge Tether (image) University of Illinois College of Engineering Caption In this experiment, ligand molecules are tethered by DNA strands to a substrate; the strands have defined tension tolerances and will burst if tension above their tolerance is applied. The integrin-ligand bond activates cellular adhesion only when the tether does not rupture, enabling a measurement to be taken of the molecular force. The cultures show cell adhesion and spreading at a tension tolerance of 43 pico-Newtons but not at 33 pico-Newtons. Credit University of Illinois Usage Restrictions None 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.