FCRL3 and juvenile idiopathic arthritis: Ramírez-Bello et al. explored the relationship between FCRL3 polymorphism and juvenile rheumatoid arthritis (JRA) in the Mexican population and found that FCRL3_3 (rs7528684) and FCRL3_6 (rs3761959) showed significant MAF difference (p = 0.03 and p = 0.01, respectively).