VICTOR HABBICK VISIONS / SCIENCE PHOTO LIBRARY VICTOR HABBICK VISIONS / SCIENCE PHOTO LIBRARY
H1N1 flu virus particles. Computer artwork of two H1N1 influenza (flu) A virus particles (virions). At the virus' core is the RNA (ribonucleic acid) genetic material (centre in cut-away virus at left). This is surrounded by a nucleocapsid (middle layer) and a lipid envelope (outer layer). In the envelope are two types of protein spike, haemagglutinin (H, tri-lobed spike) and neuraminidase (N, square), which determine the strain of virus. These are used for recognising and binding to the host cell.
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