PRKAB2 and rheumatoid arthritis: We detected the expression levels of AMPKβ1 (PRKAB1) and AMPKβ2 (PRKAB2) in FLSs by qRT-PCR, however, we observed that the expression of PRKAB2 was absent in FLSs from HC, OA, and RA (Figure S4 in Supplementary Material).