Spanish flu H1 antigen, molecular model

Spanish flu H1 antigen, molecular model

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Credit: DR MARK J. WINTER/SCIENCE PHOTO LIBRARY

Caption: Spanish flu virus antigen. Computer model showing the molecular structure of a haemagglutinin 1 (H1) antigen from the Spanish influenza (flu) virus particle. Alpha helices (coils), beta sheets (arrows) and linking regions (thin, wire-like) can be seen forming the quaternary structure of the spike-shaped surface protein. Haemagglutinin binds to host cells, allowing the virus to enter them and replicate. This virus was responsible for the 1918 flu pandemic.

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