Fig. 2
From: A novel Betaretrovirus discovered in cattle with neurological disease and encephalitis
Phylogenetic analysis showed the affiliation of all bovine retrovirus CH15 genomes to the Betaretrovirus genus. The maximum-likelihood tree was based on selected coding-complete exogenous virus sequences of the genera Betaretrovirus, Lentivirus, Gammaretrovirus, Deltaretrovirus, and Bovispumavirus, as well as the env mRNA of bovine endogenous retroviruses. Branches are labeled by GenBank accession number and virus name. The scale indicates the number of substitutions per site, reflected by the branch lengths. Unclassified betaretroviruses are marked with an asterisk. CH, Switzerland; AT, Austria