Figure 4From: Molecular evolution of the H6 subtype influenza a viruses from poultry in eastern China from 2002 to 2010Phylogenetic tree of the open reading frames of the M and PA genes of the H6 influenza A viruses isolated in Eastern China. Viruses highlighted with the black triangles are characterised in this study. The tree was constructed using the neighbour-joining method of MEGA 5.0, with 1,000 bootstrap trials to assign confidence to the groupings.Back to article page