Flagellum (image) Indiana University Caption Scientists have learned a tiny molecular clutch disengages the flagellum's tail from the engine that powers its rotation. To see the full image, click the link below. Credit Zina Deretsky, NSF Illustration courtesy of the National Science Foundation Usage Restrictions None 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.