Differences (IMAGE) Instituto de Medicina Molecular Caption In circulating white blood cells (left side) the "batteries" or mitochondria (in green) have a stronger signal -- than in intestinal white blood cells, that are in a 'low energy mode' (right side). Blue indicates the cell's nucleus. Credit Špela Konjar, iMM. Usage Restrictions High resolution images are available upon request 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.