Research Article

Natural Selection Determines Synonymous Codon Usage Patterns of Neuraminidase (NA) Gene of the Different Subtypes of Influenza A Virus in Canada

Figure 3

Neutrality plot between GC3 and GC12 for the NA gene of all and each of the major subtypes in Canada. (a) Neutrality plot for all major subtypes. The fitted regression line has the equation . (b) Neutrality plot for subtype H1N1. (c) Neutrality plot for subtype H3N2. (d) Neutrality plot for subtype H3N8. (e) Neutrality plot for subtype H4N6. (f) Neutrality plot for mixed subtype.
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