Most common Gambian βS haplotypes. The 'most common' short-range haplotype, including extension of the haplotype to 400 kb is shown in part A. Individual haplotypes are arrayed along the Y-axis with SNPs on the X-axis. At each SNP position, the major allele of each SNP is represented in blue and the minor allele in orange. The 70 kb region defining the 'short-range' βS haplotypes is indicated above the figure and by the white border. A comparison of this 70 kb region in Jamaica, Gambia and Yoruba is shown in part B using markers successfully genotyped in all three populations.