Phylogenetic trees for the M gene. Figures shows phylogenetic trees constructed using RAxML. Scale bar shows evolutionary distance inferred by RAxML algorithm. Trees are shaded in colors according to host (A), subtype (B), year (C), geographical location (D), and H5N1 (E). To compare evolutionary characteristics such as evolution rate and selective pressure, we named each lineage as shown in (F).
Furuse et al. Virology Journal 2009 6:67 doi:10.1186/1743-422X-6-67