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PAML trees of non-synonymous (A) and synonymous (B) substitutions in ORF1a (left panel), ORF1b (middle panel) and ORF2 (right panel) of astrovirus. PAML trees have been constructed by decorating the topology supplied by the input treefile with the branch lengths estimated by means of PAML approximation. The scale bars indicate the relative extent of mutational rates as (non-) synonymous substitutions per (non-) synonymous site corrected for multiple hits at the same site.
