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Phylogenetic tree analysis of newly characterized full-length env gene sequences. An unrooted phylogenetic tree was constructed with complete env gene sequences using the neighbor-joining method and the Kimura two-parameter model. Viruses with two lineages are indicated by underline; monophyletic env sequences are indicated by plain text. The branch lengths are drawn to scale (the scale bar represents 0.02 nucleotide substitutions per site).
