Symbiosis (IMAGE) University of California - Santa Cruz Caption CARD-FISH images of UCYN-A haptophyte symbiosis in the Bering Sea. The nitrogen fixing cyanobacteria UCYN-A2 are shown in red and the Haptophyte algae host are shown in blue and green. The bottom row are nanoSIMS results of the cells identified by CARD-FISH. The colors represent the 15N:14N ratio, warmer colors show higher enrichment of 15N, indicating they are fixing 15N2 gas. Credit Courtesy of Jonathan Zehr Usage Restrictions For use only with news coverage of this research. 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.