STAT4 and rheumatoid arthritis: The dense genotyping of immune-related loci provided by the Immunochip platform allowed identifying NAB1 as a new susceptibility locus for RA within the 2q22.3 region, which also contains the pan-autoimmune susceptibility gene STAT4. In addition, interrogation of publicly available eQTL data sets showed that the associated NAB1 variant, rs10931468, acts as an eQTL affecting NAB1 expression in lymphoblastoid cell lines.