Molecular Thermostat (IMAGE) University of Pennsylvania School of Medicine Caption Mitochondria in cells (stained green) are the cell's furnace. New data from the Genes & Development paper shows that the co-dependency of Rev-erb-alpha and heme affects mitochondrial function. Credit Nan Wu, University of Pennsylvania School of Medicine 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.