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Influenza A and b viruses induce apoptosis in A549 and MDCK II cells at MOI 1.0. (a) Nuclear staining of the infected cells with FITC staining. (b) Chromosomal DNA fragmentation. DNAs were prepared from A549 cells infected with virus at 8 h intervals and separated by 2% agarose gel electrophoresis, followed by staining with ethidium bromide.
