Fig 2. Maximum clade credibility tree inferred from 1,169 Yamagata-lineage HA gene sequences and corresponding genotype constellations.

Branches of the phylogeny are labeled with amino acid substitutions occurring along the phylogenetic ‘trunk’ and colored by well-supported clade distinction (see legend). Clade classifications of each gene are similarly indicated by colored bars. White bars indicate that no sequence was available for that gene. Nodes with greater than 0.70 posterior probability support are shown with circle node shapes.