Researchers Rethink Symbiosis 2 (IMAGE) University of British Columbia Caption This is an Euplotes host, stained nuclei and Polynucleobacter bacteria. Credit Vittorio Boscaro and Patrick Keeling Usage Restrictions None 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.