Figure 1From: Correlated evolution of nucleotide substitution rates and allelic variation in Mhc-DRB lineages of primatesAmino acid variability plot for 1174 MHC-DRB alleles from 46 primate species (all species and loci combined). The number of different amino acids found on the given position is shown. The considered contact residues of the antigen-binding sites (ABS) are drawn in black (see text for details).Back to article page