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. 2006 Oct 26;1:34. doi: 10.1186/1745-6150-1-34

Table 2.

Numbers of synonymous and nonsynonymous substitution per site (dN/dS) in H1N1 HA

Protein sites dN/dS ratio; tree partition
All branches Inter-clade branches* Other branches
H1N1 HA 0.20 ± 0.04 0.15 ± 0.08 0.21 ± 0.04
H1N1 HA1 0.22 ± 0.05 0.19 ± 0.12 0.22 ± 0.05
H1N1 HA2 0.15 ± 0.05 0.08 ± 0.09 0.17 ± 0.06

*refers to several branches of the H1N1 HA tree that connect the 2000–2001 clade and the 2000–2004 clade; unlike H3N2, the trunk is not identifiable in the H1N1 tree within the analyzed time interval.