Sliding window analysis of per-site sequence diversity (π) within each population for resequenced regions of CD2. A window size of 150 bp and a slide of 25 bp were used. Regions sequenced for each locus are denoted as filled and exons as thicker rectangles in the scaled locus representation underneath. Plots are colour coded with reference to population (blue, African Bos taurus; red, European Bos taurus; yellow, Bos indicus). Note the peak in diversity within each population at exon 3.