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Immunohistochemical staining for expression of VEGF protein after DNA/LF2000 transfection in hepatocarcinoma SMMC-7721 cells. Positive signal for VEGF protein is brown and located in cytoplasm. A: (×100), B: (×400): PCDNA3 transferred SMMC-7721 cells; C: (×100), D: (×400): PCDNA3-as-VEGF165 transferred.
