FIG. 5.

Viral RNA synthesis during early infection measured by scintillation counting. BHK-21 monolayers (solid bars) and 72-h-cultured rat cerebellar granule neurons (open bars) were infected with parental strains and recombinants at 20 PFU per cell. [³H]uridine was added at 3 h postinfection, and cells were lysed 3 h later in 10% SDS. Actinomycin D was used to inhibit cellular RNA synthesis. Control cells (C) were uninfected. The star indicates a value below 500 cpm.