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SEM analysis of the surface of virus-infected cells. Vero cells infected with the engineered viruses (panels 3 to 5) or virus A2 (panel 2), as well as uninfected Vero cells (panel 1), were fixed and processed for SEM at 25 h postinfection and photographed at a magnification of ×5,000. Single filaments (arrowheads) as well as bundles of filaments (arrows) are indicated. Size bar, 2 μm.
