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.
Model release not available. Property release not required.