BLK and rheumatoid arthritis: We identified a pair of haplotypes between the two BLK SNVs in RA patients because of a strong LD among them (data not shown), the TA haplotype, which carries the major alleles of the BLK rs2736340T/C and rs13277113A/G SNVs showed an association with susceptibility to RA; OR 1.36, p = 0.0023, pc 0.0024 after 100,000 permutations (data not shown).