Mitochondria of a Human Fibroblast (IMAGE) Howard Hughes Medical Institute Caption Low-oxygen conditions might reverse damage caused when power-producing mitochondria (green) malfunction. These mitochondria surround the nucleus (blue) of a human fibroblast cell in a lab dish. Credit Tslil Ast/Mootha Lab 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.