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Phylogenetic analysis of RNA-dependent RNA polymerase (RdRp) of RNA viruses with reverse transcriptase (RT) used as an outgroup to root the tree. Five major branches have been assigned a phylum rank by Internationational Committee on Taxonomy of Viruses (ICTV): Branch 1 = Lenarviricota, Branch 2 = Pisuviricota, Branch 3 = Kitrinoviricota, Branch 4 = Duplornaviricota, and Branch 5 = Negarnaviricota. Adapted from [16].
