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Transfection efficiency and toxicity of pIRES-hrGFPII-eIL-12. GFP- (■) and PI- (◊) positive cells 24 h after transfection with pIRES-hrGFPII-eIL-12. Mean cell proliferation (▲) (48 h and 72 h after transfection with pIRES-hrGFPII-eIL-12). Each bar represents a mean ± SD. * p ≤ 0.05.
