EphA2/ephrin-A1 Signaling Complexes (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Metal lines embedded into a silica membrane beneath a cell act as a diffusion barrier, impeding the mobility of EphA2/ephrin-A1 signaling complexes so that they accumulate along the boundaries of the barrier. Without the barrier, the complexes are transported to a centralized location within the cell. Credit (Image from Jay Groves research group) 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.