Adaptive molecular evolution of the Major Histocompatibility Complex genes, DRA and DQA, in the genus Equus

Table 4 Selection tests over all sites, antigen binding sites (ABS) and non-antigen binding sites (non-ABS)

N = number of codons; d_N/d_S = synonymous to non-synonymous rate ratio; Z test p-values for rejecting the null hypothesis of neutrality (d_N = d_S) for the alternative hypotheses of non-neutrality (d_N ≠ d_S), positive selection (d_N >d_S), and purifying selection (d_N <d_S).* There were no synonymous mutations, therefore d_N/d_S is undefined.

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