Expression of melanoma differentiation-associated-7/interleukin-24 after infection with SG600-IL24 protein in hepatocellular carcinoma cells and normal liver cells. Cells infected with 10 multiplicity of infection of Ad.IL-24, SG600-EGFP and SG600-IL24 were collected 48 h after infection as described in “Materials and Methods”. A: Lane 1: Control group; Lane 2: Ad.IL-24 group; Lane 3: SG600-EGFP group; Lanes 4, 5, 6, 7: HepG2, Hep3B, MHCC97L and L02 SG600-IL24 groups; B: β-actin corresponsively.