IFNB1 and infection: In the C57BL/6J BMDCs, despite low levels of IFN-β mRNA expression (due to low infection rate of the immune-competent primary mouse cells), FSS13025 WT and PRVABC-59 V188A induced higher levels of intracellular IFN-β mRNA than their corresponding A188V mutant and WT viruses, respectively (Fig. 6a, b).