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Figure 1 | BMC Evolutionary Biology

Figure 1

From: The nonadaptive nature of the H1N1 2009 Swine Flu pandemic contrasts with the adaptive facilitation of transmission to a new host

Figure 1

Phylogeny estimated for the NA protein-coding gene. Sequences from the 2009 H1N1 pandemics and the clade sustaining them are in red. Host switch events are marked with a star (*): in black for swine-to-human event and in gray for human-to-swine events. Branch lengths are proportional to time; the horizontal axis below the tree gives the scale.

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