FIG. 5.
Mutated promoters mut122 and mut90 display abnormal virus-induced activities. Cells from the wild-type L929wt330 strain or the mutated L929mut122 and L929mut90 strains were either mock infected (0 h) or infected with NDV and collected 10 and 15 h after infection. The corresponding CAT activities were measured. The results correspond to the averages of two independent experiments with each point in duplicate. The CAT activities for mock infection were as follows: L929wt330, 6,926 ± 132.5 cpm/h/mg; L929mut90, 2,427.5 ± 104.5 cpm/h/mg; L929mut122, 2,774.5 ± 132.5 cpm/h/mg.