Therefore, four markers were tested for association with TB in the present study: SLC1 (alleles (GT)9, (GT)10 and (GT)11), SLC6a (alleles G and A), SLC6b (alleles TGTG and ----) and IL8rb (alleles C and T) (shown in nomenclature used in our LD study). Here, CXCR2 is linked to tuberculosis.