Analysis in living cells of the replication of GFP-tagged KΔUL36. Cells infected with K26GFP (A, C, and E) and KΔUL36-GFP (B, D, and F) at an MOI of 10 PFU/cell were visualized live in a confocal microscope at 8 (A and B), 12 (C and D), and 18 (E and F) h after infection. Magnification was ×60 (A, B, C, E, and F) or ×100 (D).