'Round-the-Clock Metabolism (IMAGE) Ecole Polytechnique Fédérale de Lausanne Caption This is a diagram showing the different expression of proteins in liver cells during the day/night cycle. Credit Daniel Mauvoisin/EPFL Usage Restrictions To be used for media purposes only. Please mention credit. 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.