Spinning Cilia (IMAGE) Washington University in St. Louis Caption Approximately 9-micron-long cilium beating at about 60 Hz. The video is slowed down by a factor of 40. The cell is visibly spinning thanks to its unique cilium. Credit Philip Bayly Usage Restrictions Usage allowed with credit 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.