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Titer reduction assay against wt-PR8 virus. MDCK cells were infected with influenza PR8 virus in presence of DMSO or indicated samples at 20 µg/mL. At 36 hours after infection, the viral yield was determined. Results are the means ± standard deviation. All data have three multiple duplications. ∗∗∗, P < 0.0001; ns, no significant difference. The dotted line represents the detection limit.
