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Induction of apoptosis in HepG2 cells with cytosine deaminase (CD) and/or human sulfatase-1 (Hsulf-1) gene therapy. (a) The apoptotic cells were detected by flow cytometry. (b) The cell apoptosis rate was caculated using flow cytometry. *P < 0.05 compared with HepG2/blank; †P < 0.05 compared with HepG2/Hsulf-1 or HepG2/blank; ‡P < 0.05 compared with HepG2/CD, HepG2/Hsulf-1 or HepG2/blank.
