(A–B) Immunoblot analyses of HtrA2/Omi in lysates of mock-infected HF (M) or HF infected (MOI of 3) with Towne-BAC or ΔUL37x1 for 24, 48, 72, 96, or 120 h and control cell lysates from HeLa cells transfected with HtrA2/Omi expression plasmid (+) or control plasmid (−). The expected migration of the 49 kDa immature, pro-HtrA2/Omi and 36 kDA mature, HtrA2/Omi was calculated based on migration of molecular weight markers (not shown). Immunoblot detection of HtrA2, β-actin and IE1 are shown. (C–N) Immunofluorescent images of HtrA2/Omi (C, F) and cytochrome c (I, L) (red), and GFP fluorescence (green) (D, G, J, M) and merged images (E, H, K, N) at 72 h (C–H) or 96 h (I–N) postinfection (MOI of 0.001) with ΔUL37x1 (C–E, I–K) or Towne-BAC (F–H, L–N). Original magnification ×1000.