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Paramyxovirus particle. Coloured transmission electron micrograph (TEM) of a paramyxovirus particle. The internal structure of the virus has been revealed, including the helical structures (green) of the ribonucleic acid (RNA). The virus particle is a core of RNA surrounded by a lipid envelope (red), which has broken open, releasing the RNA. Several members of the paramyxovirus group are disease-causing (pathogenic) viruses. These include the mumps virus, the measles virus (rubeola) and the respiratory syncytial virus (RSV), which causes respiratory infections. Magnification: x170,000 when printed 10 centimetres wide.
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