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SARS virus particles. Coloured transmission electron micrograph (TEM) of numerous SARS virus particles (red) in a host cell. Severe acute respiratory syndrome (SARS) is a fatal lung disease that first appeared in China in 2002. The SARS virus is a coronavirus. The coronaviruses take their name from their crown (corona) of surface proteins, which are used to attach to and penetrate their host cells. Once inside a cell, the virus particles use the cell machinery to make more copies of themselves. Magnification: x56,000 at 10 centimetres high.
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