Linkage disequilibrium (r2) plot for Caucasians. Figure 5 is analogous to the D' plots shown in Figure 3. The value of r2 is shown on a grey scale, where white represents r2 = 0, black represents r2 = 1, and shades of grey represent 0<r2<1. All plots were generated using HaploView v3.2. SNP names and locations are as in Figure 3.