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Induction of the Mx promoter construct by zfIFN expression. ZF4 cells were either induced with 25 μg of poly(I)-poly(C)/ml, transfected with zfIFN or an empty vector, or untreated. After 24 h, cells were lysed and luciferase activity was measured. The experiment was performed in triplicate, with each bar representing the mean of three samples. Error bars, standard deviations.
