SEM of <i>Guillardia theta (IMAGE) DOE/Joint Genome Institute Caption Scanning electron micrograph (SEM) of alga Guillardia theta, the first cryptophyte sequenced. These algae still possess the nucleus (nucleomorph) and cytoplasm of their algal endosymbionts in a highly reduced and simplified form. Credit Dr. Geoff McFadden, University of Melbourne, Australia 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.