FIG. 4.

S1 nuclease protection analysis of promoter activity at early times after infection with viral stocks. Peripheral blood lymphocytes were infected with mB95 or mE2mut virus, and cells were harvested for RNA at 24, 72, and 122 h postinfection. RNA (10 μg) was probed for Cp- and Wp-initiated transcripts. pos. cntl., positive control. (A) Representative experiment. (B) Summary of four experiments. Error bars indicate standard deviations.