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A tree generated in ViPTreeGen 70 encompassing 49 high-quality and complete ancient phages, their 265 closest relatives from IMG/VR 29 , and all 4703 prokaryote-infecting viruses from RefSeq 76 . The ancient phages are identified with red circles. Putative families were defined using a percentage of shared genes and amino acid identity between each pair of viruses. Clusters containing at least one ancient phage are highlighted in yellow and listed in Supplementary Data 11 . The purple and blue highlighted clades represent putative families of Salmonella -infecting phages and T4 bacteriophage-related genomes, respectively. Outer rings provide additional information for each phage, such as its host assignment and genome size. Source data are provided as a Source Data file.

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