Fluorescence Microscope (IMAGE) Technical University of Munich (TUM) Caption Dr. Zeynep Oekten and co-author Willi L. Stepp at the fluorescence microscope they use to observe the motor proteins running along the microtubules (see video). Credit Andreas Battenberg / TUM 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.