Linkage disequilibrium between the -35 SNP and the HLA-C alleles present in the Black and Caucasian South African population groups.

1the total number of individuals genotyped in each population group.2the observed frequency of each two-locus haplotype.3Lewontin's D' measure of linkage disequilibrium [19].4p-values are calculated using an exact test for linkage disequilibrium [20], and are significant at p5the number of chromosomes on which the two-locus haplotype was found to occur.