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Correlation of PV branch lengths and their associated rodent hosts. Branch lengths are in expected number of nucleotide substitutions per site. Branch lengths are derived from the ML phylogeny in Figure 2. Since there is not perfect concordance between host and virus phylogenies for the Mus, Mastomys, and Apodemus taxa, the branch lengths to the common ancestor for the three taxa was used as a proxy instead of the individual branches.
