Stained mitochrondria in C. elegans (IMAGE) University of California - Berkeley Caption A cluster of nematodes, C. elegans, after activation of the olfactory circuits that sense bacteria. The cells within each nematode, in particular the gut cells, fluoresce green, indicating that their mitochondria have initiated a stress response in preparation for an attack by the bacteria. Credit Julian Dishart and Andrew Dillin, UC Berkeley Usage Restrictions none License Original 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.