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Virion morphogenesis of HSV-1 KOS. RK13 (A to E) and Vero (F to H) cells were infected with HSV-1 KOS at an MOI of 1 and fixed and processed for electron microscopy 14 h after infection. Bars, 5 μm (A), 3 μm (F), 1 μm (H), 500 nm (B to E), and 300 nm (G).