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

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

   Sites
Locus   All ABS Non-ABS
  N 81 20 61
  dN/dS 0.302 n/a* 0.202
DRA Z; dNdS 0.143 0.121 0.096
  Z; dN >dS 1 0.058 1
  Z; dN <dS 0.074 1 0.049
  N 67 18 49
  dN/dS 0.990 1.013 0.915
DQA Z; dNdS 0.975 0.978 0.715
  Z; dN >dS 1 0.489 1
  Z; dN <dS 0.488 1 0.359
  1. N = number of codons; dN/dS = synonymous to non-synonymous rate ratio; Z test p-values for rejecting the null hypothesis of neutrality (dN = dS) for the alternative hypotheses of non-neutrality (dNdS), positive selection (dN >dS), and purifying selection (dN <dS).* There were no synonymous mutations, therefore dN/dS is undefined.