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Relative mRNA expression levels of (A) AP2, (B) PPARγ, (C) RUNX2 and (D) Col I in mesenchymal stem cells in the different groups (control group, TANFH group and SANFH group). ##P<0.05 vs. control group; **P<0.05 vs. TANFH group. AP2, adipose-specific 422; TANFH, trauma-induced avascular necrosis of the femoral head; SANFH, steroid-induced avascular necrosis of the femoral head; PPARγ, peroxisome proliferator-activated receptor-γ; Col I, collagen type I.
