Efficiency of gene transduction and SVV expression: (A): Expression of green fluorescent protein in GFP-MSCs. (B): Expression of green fluorescent protein in SVV/GFP-MSCs. (scale bar = 100 um). (E-G): The efficiency of gene transduction was analyzed by FACS: (E) Control MSCs, (F) GFP-MSCs, (G) SVV/GFP-MSCs. (C-D): SVV expression in gene modified MSCs, (C): no SVV expression in GFP-MSCs, (D): stronger SVV expression in SVV/GFP-MSCs (scale bar = 50 um in A, B, C and D).