Fig. 4From: The strength of selection is consistent across both domains of the MHC class I peptide-binding groove in birdsLinear associations in selection signature (a the number of negatively selected residues, b number of positively selected residues, c dN/dS ratio for 20 most positively selected residues) between MHC class I exon 2 and exon 3 across 20 avian families. Linear regressions (solid lines) with 95% confidence intervals (dashed lines) are shownBack to article page