BLK and rheumatoid arthritis: Because the BLK rs13277113A/G variant is in high LD with rs2736340T/C (r2 ≈ 1), we also observed a similar association between BLK rs2736340T/C and RA, C v T; OR 1.39, p = 0.001, and under the recessive and codominant models, the OR were 1.55, (p = 0.0008) and 2.58 (p = 0.0036), respectively (Table 1).