IFNB1 and listeriosis: Therefore, we sorted CD11b+CD11c−macrophages, CD11c+CD11b− dendritic cells (DCs), CD11b+CD11cintLy6C+ Tip-DCs and B220+CD11c− B cells as a negative control from IFN-β+/floxβ-luc x LysMcre mice 24 hours after Listeria infection and tested for LysM, LysMcre as well as IFN-β expression by RT-PCR.