CXCL9 and rheumatoid arthritis: Tail vein injection of MSC-derived exosomes containing miR-320a into CIA mice alleviated arthritis severity, which was correlated with suppressed CXCL9 levels.224 MSC-derived exosomal miR-150 interfered with the migration, invasion, and tube formation of RA-FLSs through a mechanism involving MMP14 and VEGF.