FIG. 2.

Northern blot analysis of ISG 56K RNA. HEL cells were mock infected (M, IFN) or infected with the indicated virus (with [+] or without [−] UV inactivation) at an MOI of 5. Where indicated, cycloheximide (CHX) was added at 100 μg/ml 1 h prior to infection and maintained throughout. At 24 h postinfection, RNA was extracted and analyzed for ISG 56K RNA levels by Northern blot hybridization.