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Log(dN/dS) values across avian influenza H7 HA1 sites, on different NA subtype backgrounds. The natural logarithm of the dN/dS values from was taken, so that sites with log(dN/dS) > 0 corresponded to dN/dS > 1, and sites with log(dN/dS) < 0 corresponded to dN/dS < 1 (the value log(dN/dS) = 0, i.e. dN/dS = 1, is shown as a dotted red line). The dN/dS values for each site are colour coded according to the background NA subtype. Codon sites correspond to the H3 numbering.
