MEFs and HEK293 and NMuMG cells were cultured in DMEM with 10% FBS. Primary wild-type or Mst1−/− MEFs were isolated, expanded, and cultured by conventional methods. Xtremegene HP (Roche) or Polythylenimine (PEI, Polyscience) transfection reagents was used for transfection. Infection of SeV, VSV, and HSV-1 was as described (Xu et al. 2014 (link)).