Figure 4. Immunofluorescence staining of (A–C) ud-NHBE cells and (D–F) wd-NHBE cells at 16 h post infection with (A and D) mock infection, (B and E) HK98/H1N1 and (C and F) VN04/H5N1.

Influenza nucleoprotein and matrix protein was stained in green with FITC-conjugated mouse antibody.