Brain (IMAGE) University of Michigan Caption This illustration depicts neurons firing (green structures in the foreground) and communicating with nanotubes in the background. Credit Illustration courtesy of Mohammad Reza Abidian 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.