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We analyzed the adaptation of influenza viruses to growth in differentiated airway epithelial cells of a new host by passaging an avian H9N2 virus three times in porcine precision-cut lung slices (PCLS). Sequence analysis revealed four mutations: one each in the PB2 and NS1 proteins, and two in the HA protein. In this study, we characterized the PB2 mutation G685R by generating recombinant H9N2 viruses...
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