Thin section transmission electron micrographs of BHK-BSR cells infected with Hayes Yard virus. A Top arrow indicates a bullet-shaped virus budding from the plasma membrane. The bottom two arrows indicate transversely sectioned virus in the extracellular space. C: cytoplasm, N: nucleus. B The arrow indicates a cone- or bullet-shaped particle located at the surface of the cell. Scale bars (left bottom corner of A and right bottom corner of B) represent 100 nm.