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Expression of IL-Ra protein demonstrating that the ratio of IL-Ra/β-actin was significantly higher in both the BMSC + controlLV + IL-1Ra group than in the BMSC and BMSC + controlLV group at the fifth passage (**P<0.01, Student's t-test). BMSC, bone marrow-derived mesenchymal stem cell; LV, lentivirus; IL, interleukin; Con, control.
