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Herpes particles. Coloured transmission electron micrograph (TEM) of herpes virus particles on the surface of a cell. Each particle consists of a deoxyribonucleic acid (DNA) core (red) surrounded by an icosahedral (20-sided) outer coat (capsid, green), which is itself surrounded by an envelope (yellow). The herpes family of viruses cause a range of disease in humans, such as cold sores and genital herpes (herpes simplex viruses) and shingles (herpes zoster virus). Magnification: x33,300 when printed at 10 centimetres wide.
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