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29.0 x 22.1 cm ⏐ 11.4 x 8.7 in (300dpi)
DAVID MCCARTHY / SCIENCE PHOTO LIBRARY DAVID MCCARTHY / SCIENCE PHOTO LIBRARY
Influenza virus particle, coloured transmission electron micrograph (TEM). The virus consists of ribonucleic acid (RNA), surrounded by a nucleocapsid (light green) and a lipid envelope (dark 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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