Fig. 3.
Pattern of amino acid substitution in PPS sites of human influenza (H1N1) HA protein between 1918 and 2009. The penalty on Zk is λ=0.001. Each colored dot represents a particular amino acid as indicated in the legend.

Pattern of amino acid substitution in PPS sites of human influenza (H1N1) HA protein between 1918 and 2009. The penalty on Zk is λ=0.001. Each colored dot represents a particular amino acid as indicated in the legend.

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