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Both HT-1080 and CCD-1122Sk secrete IFN-β. Culture medium was collected at various time points postinfection, and the levels of biologically active human IFN-β were determined by the human IFN-β ELISA kit. The levels of IFN-β secreted by normal CCD-1122Sk cells (black bars) and HT-1080 tumor cells (white bars) are shown.
