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293T/VPS4 inducible cells with (+) or without (−) doxycycline induction were infected with (a) Wt VSV; (b) influenza virus A/Udorn/72, or (c) A/WSN/33. Culture supernatant was harvested at 7 hp.i. (VSV) or 24 h p.i. (influenza virus) and virus infectious titer was determined by plaque assay.
