DAVID MCCARTHY / SCIENCE PHOTO LIBRARY DAVID MCCARTHY / SCIENCE PHOTO LIBRARY
Influenza virus particles, coloured transmission electron micrograph (TEM). The virus consists of ribonucleic acid (RNA), surrounded by a nucleocapsid (blue) and a lipid envelope (green). In the envelope are two types of protein spike, haemagglutinin (H) and neuraminidase (N), which determine the strain of virus.
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