Factors at Play (IMAGE) Imperial College London Caption A graph of cell size, an image of a clock with day/night portion, and a graph of daylight and nighttime across 24 hours, all feeding into a graph showing different lengths of cells dividing at different times of the day Credit Bruno Martins 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.