Supplementary Figure S1
Pessia, A., Grad, Y., Cobey, S., Puranen, J. S. & Corander, J. K-Pax2: Bayesian identification of cluster-defining amino acid positions in large sequence datasets.
Supplementary Figure S1. Maximum likelihood phylogenetic tree of influenza A/H3N2 HA, restricted to K-Pax2 clusters consensus sequences. The 57 strains are the clusters' earliest consensus sequences.