STAT3 and rheumatoid arthritis: After overexpressing of lncRNA XIST or let‐7c‐5p in RA rat osteoblasts, RT‐qPCR was adopted to examine lncRNA XIST, let‐7c‐5p, and STAT3 mRNA expression, and Western blot analysis was used to determine STAT3 protein expression (Figure 3G, H).