Proportions of putative protein coding sequence groups encoded by the segment 2 genomic strand RNAs of influenza A viruses among different serotypes.

<p>Blue arrows indicate open reading frames encoded by segment 2 positive sense RNAs of influenza A viruses. Red arrows indicate putative protein coding sequences encoded by segment 2 genomic strand RNAs of influenza A viruses. AIAV, HIAV and MIAV indicate influenza A viruses from avian, human and mammalian hosts, respectively. The “HxNy” in the pie chart indicates the proportion of segment 2 genomic strand RNAs with putative protein coding sequences that belong to H1N1, H2N2, H3N2, H5N1 or H7N9 serotypes. The “Other” in the pie chart indicates the proportion of segment 2 genomic strand RNAs with putative protein coding sequences that do not belong to the H1N1, H2N2, H3N2, H5N1 or H7N9 serotypes. The “Without” in the pie chart indicates the proportion of segment 2 genomic strand RNAs without a putative protein coding sequence.