Ion Flux (image) University of Vienna Caption This is a schematic representation of the sodium ion channel (light blue): Top: influx of sodium ions (shown in yellow) and orientation of the E53 amino acid in "non-flipped" conformation. Bottom: conformational change of E53 (flip) during ion efflux, arrows indicate the barrier for sodium efflux. Credit Copyright: Song Ke Usage Restrictions The image may only be used with appropriate caption or credit. 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.