Transmission electron micrograph of HCMV infected fibroblast at late stage of infection. The whole cell (a), nucleus (b) and cytoplasm (c) show several types of virus particles normally present during infection. Abbreviations: Nuc, nucleus; Cyt, cytoplasm; AC, assembly compartment. Symbols: white arrowheads, B-capsids; black arrowheads, C-capsids; white arrows, A-capsids; black arrows, mature virus particles; black diamondheads, dense bodies. Bars, 5 μm (a) and 1μm (b) and (c).