For the data used in Figure 5, we use an unpublished sample collected and genotyped by Dr. Jonathan Seidman and Dr. S. Sangwatanaroj. This consisted of 25 samples from Northern Thailand (after removing some individuals who are close relatives of people whose samples we retained) and 45 samples each from China and Japan (data drawn from the International Human Haplotype Map Project [32]). The Northern Thai samples were genotyped using an Affymetrix Xba chip. The dataset analyzed consisted of the overlap between the SNPs successfully genotyped in HapMap and the Affymetrix chip, and included 40,560 SNPs.
