Research Article

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

Table 2

The correlation between different codon usage indices and the first two axes of COA analysis. The most correlated variables for each axis of COA are marked in boldface. Significant correlations at the level of are marked with asterisks.

CA1CA2

A0.191007*0.63365*
C−0.024470.10123*
G0.523703*−0.05803*
T−0.47806*0.482319*
GC0.459962*0.041116
A3s0.37797*0.78633*
C3s0.55916*0.21002*
G3s0.689769 * −0.03151
T3s−0.41266*0.586561*
GC3s0.144409*0.161182*
ENC−0.47381*0.511762*