Mictrotuble with EB3 (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption Microtubules are hollow cylinders with walls made up of tubulin proteins -- alpha (green) and beta (blue) -- plus EB proteins (orange) that can either stabilize or destabilize the structure of the tubulin proteins. Credit image courtesy of Eva Nogales group, Berkeley, CA 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.