Table 2. The average rates of non-synonymous (dN) and synonymous (dS) substitutions (mean and standard errors obtained using 1000 bootstrap replicates), Z-test of positive selection with p-value included.
| Species | Sites | dN | dS | Z | p |
| P. toxostoma | All sites | 0.215 (0.028) | 0.165 (0.036) | 1.165 | 0.123 |
| ABS | 0.500 (0.086) | 0.188 (0.083) | 3.443 | <0.001 | |
| non-ABS | 0.138 (0.024) | 0.158 (0.043) | −0.413 | 1.000 | |
| C. nasus | All sites | 0.238 (0.031) | 0.175 (0.033) | 1.597 | 0.056 |
| ABS | 0.591 (0.104) | 0.246 (0.085) | 3.319 | 0.001 | |
| non-ABS | 0.148 (0.023) | 0.154 (0.038) | −0.143 | 1.000 |