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Electron microscopy of virus particles on the surfaces of Vero cells infected with F-BAC gB−/gD−, F-BAC, or F-BAC gD-kan. Vero cells were infected with F-BAC gB−/gD−, F-BAC (w.t.), or F-BAC gD-kan (gD−) for 19 to 28 h and then fixed, stained, and sectioned for electron microscopic examination.
