Table 1. The number of synonymous (dS) and non-synonymous (dN) substitutions per site for ABS, non-ABS and all sites in exon 2 of MHC class IIB (mean±SE); the value of Z-test of positive selection and probability (P) that positive selection acts on these sites.
dN±SE | dS±SE | dN/dS | Z-test | P | |
ABS | 0.303±0.075 | 0.134±0.058 | 2.261 | 2.156 | 0.017 |
non-ABS | 0.066±0.017 | 0.056±0.025 | 1.179 | 0.401 | 0.344 |
all sites | 0.120±0.020 | 0.078±0.023 | 1.538 | 1.610 | 0.055 |