KCNJ12 and rheumatoid arthritis: Furthermore, our analysis revealed drug target genes with comparable numbers of functional variants per residue, including the dofetilide target KCNJ12 (0.31 variants/residue) and the target for the rheumatoid arthritis drug niflumic acid, PLA2GLB (0.30 variants/residue) (Additional file 2: Table S2).