MERTK and rheumatoid arthritis: Some examples are another single-cell RNA-seq analysis of human RA synovium that identified MerTKpos cells as an M2 cluster [278], the analysis of total human synovial CD14pos cells exposed to anti-inflammatory medications used to treat RA (anti-TNF, tofacitinib, and dexamethasone) that upregulated MerTK [282], or the analysis of mouse synovial macrophages associated with disease resolution in a model of serum transfer-induced RA [219].