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Down-regulation of PCNA protein by siRNA in PFC in vitro and in vivo. Immunofluorescence staining indicated the expression of PCNA decreased in PFC and NFC transfection with Skp2 siRNA (C, F) when compared with hPFC and hNFC transfection with pSuppressor vehicle (A, D) or without transfection (B, E). The scale bar is equal to 40 μm.
