JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Computer illustration of influenza (flu) viruses. The virus had an RNA (ribonucleic acid) genome. On the viral surface are three proteins: hemagglutinin (white), neuraminidase (yellow) and M2 proteins (beige). Hemagglutinin and neuraminidase determine the strain of the virus. M2 proteins are proton pumps.
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