MPIG6B and rheumatoid arthritis: To verify the results of lncRNA and mRNA sequencing, we used qRT-PCR to detect the expression of three lncRNAs (MIR3945HG-202, NONHSAT193357.1, and NONHSAT190641.1) and three mRNAs (CCL5, PFKP, and MPIG6B) selected from serum exosomes in an independent validation cohort of patients with RA, healthy controls, and patients with OA.