Linkage disequilibrium between the <i>-35</i> SNP and the <i>HLA-C</i> 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 p<0.05. 5the number of chromosomes on which the two-locus haplotype was found to occur.