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Growth characteristics of recombinant viruses with F117S and HN1169R mutations. Recombinant viruses that contained either F117S or HN169R or both were used to infect HT1080 or HeLa cells. Viral supernatants were harvested at day 0 to day 3, and titers were determined by plaque assay. Data shown represent means ± standard errors from three replicate samples.
