LASV Z, but not PICV Z, inhibits RIG-iN-induced IFN-β activation in a luciferase (LUC)-based promoter assay. 293T cells were transfected with two different concentrations [100 ng (gray bars) and 1,000 ng black bars)] of either an empty vector (V) or Z plasmids (LASV or PICV) together with IFN-β–LUC, β-Gal, and RIG-iN plasmids. neg, negative control (no RIG-iN transfection).