IFNB1 and rheumatoid arthritis: The percentage of HLA class I-expressing ucMSC increased after treatment with IFN-γ (8-fold; p < 0.05), IFN-β (5-fold; p < 0.05), Starv (2-fold; p < 0.05), VitB6 (7-fold; p < 0.05), Starv + VitB6 (9-fold; p < 0.05), RA (4-fold; p < 0.05) and MC (12-fold; p < 0.05) compared to untreated ucMSC.