Electron microscopy of cells infected with vtetOI7L. TREx-293 cells were infected with vtetOI7L at an MOI of 1 in the presence (panels A, B, and C) of 10 μg/ml TET or in the absence (panels D, E, and F) of TET. Cells were harvested at 24 hpi, immediately fixed and prepared for transmission electron microscopy. The bar in panels A, B, D, E, and F represents 400 nm. The bar in panel C represents 200 nm.