ATP-driven Transport (image) Harvard University Caption In comparison to those in normal cells (top row), fluorescent proteins in ATP-depleted cells (bottom row) took much longer to diffuse from one side of a cell to another—the distance indicated by the red dotted line. According to the study in Cell, ATP-driven processes produce the fluctuating forces required for proper transport within the cytoplasm. Credit Image courtesy of Ming Guo, Harvard SEAS. Usage Restrictions Editorial use only. 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.