Breaking Up Is Hard to Do (video) Yale University Loading video... Caption Thread-like actin filaments, strong as commercial plastic, are the muscular workhorses of our cells -- pushing on membranes to move cells to the proper location within tissues and applying pressure within the interior to keep all working parts of the cell where they need to be. These filaments do their jobs through a mysterious process of continual splitting and reassembly. In the movie, filaments are caught in the act of disassembly. Filament ends are marked by red and green arrows and the severing events are indicated by pink arrows and yellow flashes. The images answer long-standing questions about just where these breaks occur. Credit Cristian Suarez 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.