JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Molecular model of an immunoglobulin antibody molecule. This Y-shaped molecule has two arms that can bind to specific antigens, for instance viral or bacterial proteins. In doing this it marks the antigen for destruction by phagocytes, white blood cells that ingest and destroy foreign bodies. Antibodies can also kill some pathogens directly and can neutralise toxins.
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