Deep-sea mussels (IMAGE) Max Planck Institute for Marine Microbiology Caption Deep-sea Bathymodiolus mussels are found worldwide at hydrothermal vents and cold seeps. The mussels live in symbiosis with beneficial bacteria that provide them with nutrition. The mussels also have a pathogenic bacterium that infects their nuclei. Intriguingly, the only cells not infected by the pathogen are those with symbiotic bacteria. Credit MARUM, University of Bremen Usage Restrictions Only to be used in the context of this publication and citing the correct copyright. 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.