Paramecium bursaria with Chlorella spp. (IMAGE) University of Exeter Caption Paramecium bursaria with Chlorella spp. (red) and nucleic acid (bright greenyellow), highlighting the nucleic acid in symbiont nuclei and ribosomes Credit Dr Ben Makin Usage Restrictions This image may only be used with reports of this research 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.