Figure 2.
Phylogenetic tree of retroviruses, including ERV-Spuma-Spu, inferred using amino acid sequences of the Pol gene (490aa). The tree is midpoint rooted for clarity only. The newly identified ERV-Spuma-Spu sequences are labelled using a grey-shaded box with their accession numbers (different pol sequences in same contig are numbered in the suffix). The scale bar indicates the number of amino acid changes per site. Bootstrap values <70 per cent are not shown. The alignment of pol amino acid sequences is provided in Supplementary data set S1.