FIG 7 .

Phylogeny of conserved replicase subunits of representative nidoviruses. Unrooted Bayesian phylogeny based on concatenated multiple sequence alignments of conserved regions of RdRp and helicase domains of replicase polyproteins. At select nodes, Bayesian posterior probabilities and ML bootstrap values for clusters are given to the left and right of forward slashes. Nodes with 100% support are marked with asterisks. The five major nidovirus families and subfamilies are indicated, as are select genera and the currently uncategorized BPNV and possum nidovirus taxa. Known host phyla are indicated in parentheses. The branch leading to BPNV is highlighted red for emphasis.