Cells (IMAGE) University of Wisconsin-Madison Caption Image of a layer of cells showing cell peripheries (green), nuclei (blue), and actin fibers that generate traction (magenta). Credit Photo courtesy Notbohm Research Group 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.