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Exogenous late SV40 factor expression increases the proliferation of HepG2 cells. A: Colony formation assay for uninfected HepG2 cells; B: HepG2 cells transfected with pEGFP-C1; C: HepG2 cells transfected with late SV40 factor (LSF)-pEGFP-C1; D: Colony data represent the mean ± SE (aP < 0.05); E: Clone efficiency data (mean ± SE; bP < 0.05).
