(a,b) Confocal micrographs of HeLa cells expressing YFP-Nap1, YFP-Sintbad or YFP-Tank (a) or YFP-TBK1(K38M), a catalytically inactive mutant (b), stained with NDP52 antiserum 2 h after infection with S. Typhimurium. All data represent at least two independent experiments. DAPI, 4,6-diamidino-2-phenylindole. Scale bars, 10 μm; arrowheads, bacteria shown in insets. 