Mimivirus Infects Amoeba (image) University of Illinois at Urbana-Champaign Caption Giant viruses should be included reconstructions of the tree of life, researchers report in a new study. The mimivirus, shown here (small black hexagons) infecting an amoeba, is as big as some bacterial cells and shares some ancient protein structures with most organisms. Credit Professor Didier Raoult, Rickettsia Laboratory, La Timone, Marseille, France Usage Restrictions Image may be used only to accompany stories about the research described in this release. Credit required 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.