Extended Data Figure 1 : Condensed phylogenies for the internal genes.

From: Dissemination, divergence and establishment of H7N9 influenza viruses in China

Extended Data Figure 1

a, PB2 (n = 1681), b, PB1 (n = 1620), c, PA (n = 1682), d, NP (n = 1733), e, M (n = 1696) and f, NS (n = 1707) genes. The H9N2 ZJ-HJ/07 lineage from the large phylogenies (available from http://dx.doi.org/10.5061/dryad.5q7kf) is annotated and shown. Red branches indicate the H7N9 viruses, with the remaining branches representing H9N2 (the majority) or other viruses. Mutations leading to changes in amino acid usage from wave 1 to wave 2 (Extended Data Table 4) are shown in blue. Dashed brackets indicate the major clades 1–3, and vertical lines indicate their sub-clades. The background shading indicates the provinces from which the viruses were isolated (see inset map). Human samples are indicated as grey circles.