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Phylogeny of RNA virus RNA-dependent RNA polymerases (RdRps) and reverse transcriptases (RTs): the main branches (branches 1 to 5). Each branch represents collapsed sequences of the corresponding set of RdRps. The 5 main branches discussed in the text are labeled accordingly. The bootstrap support values obtained by the indicated numerator/denominator calculations are shown for each internal branch. LTR, long-terminal repeat.
