Influenza virus particles
Influenza virus particles. Computer artwork of an influenza (flu) virus particle (background) and a mutated strain of the virus (foreground). The virus consists of ribonucleic acid (RNA), surrounded by a nucleocapsid and a lipid envelope (yellow). In the envelope are two types of protein spike, haemagglutinin (H) and neuraminidase (N), which determine the strain of virus. The tiny bumps on the blue surface proteins (H) represent the mutation.
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