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Purpose To observe the involvement of Notch signaling in the epithelial-mesenchymal transition(EMT)of retinal pigment epithelial(RPE)cells and the pathogenesis of proliferative vitreoretinopathy(PVR).Methods In vitro cultivated human RPE cells(ARPE-19)were treated with 10 ng/ml transforming growth factor(TGF)-β1 for 24,48,and 72 h.