Fig. 3.  Concentration of human HGF protein in cerebrospinal fluid before and after transplantation of MSCs or HGF gene-modified MSCs. No significant difference of the concentration of human HGF was found between groups of HGF-MSCs A and HGF-MSCs B at any observation time point (P = 0.879, P = 0.574, and P = 0.393, respectively). A = ischemia for 40 min; B = ischemia for 50 min; HGF = hepatocyte growth factor; HGF-MSCs = HGF gene-modified marrow stromal cells; MSCs = marrow stromal cells.