Bacterial Armor Self-Assembly (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The binding of calcium ions to SbpA proteins starts the process by which the SbpA self-assembles into nanosheets. Ca2+ binds to SbpA with an affinity of 67 μM. Credit Image courtesy of Ajo-Franklin group, Berkeley Lab 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.