Figure 2

Phylogenetic relationships of bat and non-bat betaretroviruses. Maximum likelihood phylogenetic trees of (A) Gag, (B) Pol, and (C) Env amino acid sequences. Bootstrap values <70% are not shown, and branch lengths are drawn to a scale of amino acid substitutions per site. Bootstrap values are denoted as ** >90%; * >70% and < 90%. The trees are midpoint rooted for purposes of clarity only. βERV proteins of P. vampyrus and P. alecto are highlighted in red text. βERVs of M. lucifugus are highlighted in blue text. The clades within the Gag and Pol trees highlighted with a grey background (γ-Env) contain betaretroviruses whose Env sequence is not sufficiently closely related to the Env of other betaretroviruses to be included in the Env tree.