Rigid Hinge (IMAGE) University of Southampton Caption The rigid hinge, with its disulfide links (yellow), keeps the two antibody arms constrained, leading to stronger receptor activity. Credit University of Southampton Usage Restrictions Credit required. License Original 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.