Spine Formation Clock (VIDEO) Harvard Medical School This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Waves of vertebrae-building signals pulse outward in mouse cells mimicking a developing embryo. Credit Video: Pourquié lab 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.