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Immunofluorescence staining of influenza-infected cells. The influenza viral NP protein (green) was detected by immunofluorescence using a mouse anti-NP monoclonal antibody in A549 (A), DF-1 (B), and HD-11 (C) cells infected with PR8, H5N3, or H5N1 in the presence of 1% DMSO vehicle control or 1 mM apocynin at 24 hpi. Uninfected cells treated with 1% DMSO for 24 h were used as negative controls. DAPI staining (blue) shows the total nuclei.
