Nano-switches in the Cell (IMAGE) University of Freiburg Caption 3-D-structure of mitochondria in a budding yeast cell. Labeling with a green fluorescent protein shows that mitochondria form a tight tubular network in the cell. Credit Source: Stefan Jakobs Usage Restrictions the image may only be used with appropriate caption and 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.