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Scanning electron micrographs of WT virus and the PPPA mutant. BHK-21 cells on plastic coverslips were infected with either WT virus or the PPPA mutant at an MOI of 10. At 8 h p.i., cells were fixed and processed as described in Materials and Methods. (A and D) Uninfected cells; (B and E) WT infected cells; (C and F) PPPA mutant-infected cells. Magnifications: ×4,000 for panels A through C; ×12,000 for panels D through F.
