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Primary infection rates in the absence or presence of IFN-β. Sarcoma cell lines were pretreated for 20 h with IFN-β (1,000 U/ml) or left untreated, followed by infection with MeV-GFP at MOIs of 0.1, 1, and 10 or mock infection. For determination of primary infection rates, the percentage of GFP-expressing cells was determined at 24 hpi by FACS analysis.
