VICTOR HABBICK VISIONS / SCIENCE PHOTO LIBRARY VICTOR HABBICK VISIONS / SCIENCE PHOTO LIBRARY
H1N1 flu virus particles. Computer artwork of H1N1 influenza (flu) A virus particles (virions). In each particle's lipid envelope are two types of protein spike, haemagglutinin (H, tri-lobed spikes) and neuraminidase (N, squares), which determine the strain of virus. These are used for recognising and binding to the host cell.
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