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Background: Bone morphogenetic protein 9 (BMP9) is one of the most potent osteoinductive factors in tissue engineering.Previous studies have demonstrated that peroxisome proliferator-activated receptor γ2 (PPAR γ2), a critical adipogenic transcription factor, is the downstream target of BMP9.The aim of this study is to explore the specific effects of PPAR γ2 on BMP9-induced osteogenic differentiation of myoblast C2C 12.