(A) IFN-β, IFN-α4, and IFN-α (non4) mRNA expression in IKKβ+/+ and IKKβ−/− MEFs induced by LPS, SeV or NDV infection as determined by real-time PCR. (B) TNFα mRNA expression in IKKβ+/+ and IKKβ−/− MEFs induced by LPS, SeV or NDV infection as determined by real-time PCR. (C) IL-6 mRNA expression in IKKβ+/+ and IKKβ−/− MEFs induced by LPS, SeV or NDV infection as determined by real-time PCR. P-values are specified as *<0.05, **<0.01, ***<0.001. Representative results from 3 independent MEF isolates are shown.