Diagram shows the relationships between marine viruses and the strains of bacteria they infect. The different strains of bacteria are shown around the rim of the circle, with colors indicating different species. Tailed viruses are shown as blue circles, and tailless viruses as orange circles. Each virus is connected by lines to the varieties of bacteria they can infect, showing that the tailless varieties each infect far more different varieties than the tailed ones, which typically infect only one or two strains. (Courtesy of researchers)
