IMAGE1 (IMAGE) Nara Institute of Science and Technology Caption Star-shape molecule as gear prototype. The top arm has a different chemical structure to follow the rotation. Credit Gwénaël Rapenne (NAIST and UPS) Usage Restrictions Credit Required. 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.