Animation (VIDEO) Moscow Institute of Physics and Technology 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 The animation illustrates the calculation of the proportion of the cells that return to the cycle. The cells are initially marked with the first label, four hours later -- with the second, 19 hours after the second marking -- with the third label, and then taken for analysis an hour after that. The cells marked both with the first and the second labels returned to the cycle, while those marked only with the first exited the cycle. Credit MIPT press office. 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.