Effect of CXCR4 shRNA delivery on CXCR4 expression in bone marrow cells: Western blot on proteins isolated from rat bone marrow cells was performed to analyze CXCR4 expression. Quantitative data (upper panel) and representative images (lower panel). C = control, D2 = day 2, W3 = week 3 and W5 = week 5. *p < 0.05 as compared with control. n = 3 for each groups.