Additional file 2.

Hemagglutinin-Esterase Maximum clade credibility (MCC) phylogeny. Phylogenetic tree representing evolutionary relationships between the he genes of selected isolates. Colors represent country of origin and inferred ancestral states as in Figure 2.

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Castro-Nallar et al. BMC Evolutionary Biology 2011 11:349   doi:10.1186/1471-2148-11-349