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Lentivirus-mediated expression of BMP-2 in bone marrow-derived stromal cells is observed for at least 16 weeks. (A) Protein was isolated from articular cartilage and subchondral bone areas from each group in week 16. Western blot analysis was performed to detect the protein expression of BMP-2 and SOX9. (B) Relative expression of proteins normalized by β-actin (n=3; *P<0.05, **P<0.01). BMP-2, bone morphogenetic protein-2; SOX9, SRY-box 9; PRP, platelet-rich plasma.
