Amino acid variability by domain in the SH, G and F genes of the Texas HRSV isolates.

The non-synonymous/synonymous substitution ratio (Dn/Ds) was calculated for each domain by the comparison between GA1, GA2 and GA5 genotype strains for HRSV-A and between GB3, GB4 and BA for HRSV-B isolates. Ratio values >1 are showing selection for variation between prototype (GA1) and contemporary viruses for HRSV-A and between dominant (BA) and contemporary viruses for HRSV-B.
* Not shown in Figures. Antigenic site Ø consists in two regions (called a and b in this table) structurally related in the pre-fusion state, and located within heptad repeat domain 3 and 1 respectively [59].