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. 1998 Apr;72(4):3495–3500. doi: 10.1128/jvi.72.4.3495-3500.1998

FIG. 4.

FIG. 4

FIG. 4

FIG. 4

FIG. 4

FIG. 4

FIG. 4

Assay of β-galactosidase activity produced by each virus on each of the cell lines. (a) β-Galactosidase activities assayed at 16 h postinfection. Shown are averages of three independent experiments. Error bars indicate standard deviations. (b) Results of a time course experiment. In each case, values have been expressed as β-galactosidase activity per PFU of virus as assayed by titrating the virus harvested at each time point on permissive Vero cells.