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Phylogenetic analysis of coronaviruses based on pp1ab using Kalign multiple sequence alignment and TreeDyn tree viewer (Chevenet et al., 2006, Lassmann and Sonnhammer, 2005). Next to the branch, the virus name is indicated, along with the previously defined viral lineages, i.e. group 1 for Alphacoronavirus members, 2a, 2b, 2c, 2d for Betacoronavirus members, and 3 for the member of the genus Gammacoronavirus. Scale bar indicates nucleotide substitutions per site.
