Researchers Rethink Symbiosis (IMAGE) University of British Columbia Caption This is an euplotes host, blue-stained nuclei and red-stained 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.