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Illustration of a magnifying glass identifying viruses. The cover of Nature Reviews Microbiology, with an illustration of a giant virus in purple. Jean-Marie Volland at Donner lab. Artistic interpretation of CheckV assessing virus genome sequences from environmental samples. (Rendered by Zosia Rostomian​, Berkeley Lab) Microbial mat under the microscope. Visible layers contain different microbial communities and minerals. The team characterized viruses in a subset of the mat layers. (John Spear) Aerial view of Ace Lake in March, as ice begins to reform on the surface. (Courtesy of Anthony Hull) Metagenomic expansion of the diversity of the Nucleocytoplasmic Large DNA Viruses. The phylogenetic tree shows 2,074 giant virus metagenome-assembled genomes (green) together with 205 previously published viral genomes (white). (Frederik Schulz) EM image of Pseudomonas phage Pf, an inovirus infecting Pseudomonas hosts. Inovirus capsids are long flexible filaments visible here after sample concentration and precipitation. (Courtesy of J. Driver and P. Secor, University of Montana) The JGI team involved in the study included (left to right): first author Frederik Schulz; senior author Tanja Woyke; Rex Malmstrom; and, Danielle Goudeau (sitting). (Janey Lee)

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