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The representative complete neuraminidase sequences (NA) of 138 Chinese isolates and hemagglutinin sequences (HA) of 128 Chinese isolates of influenza A virus subtype H9N2 were analyzed to reveal codon usage bias and recombination events. A plot of the effective number of codons (ENC) against G + C context at the third position of the codons (ENC-plot) and correlation analysis demonstrated that mutational...