POLYMIME ANIMATION CO. / SCIENCE PHOTO LIBRARY POLYMIME ANIMATION CO. / SCIENCE PHOTO LIBRARY
Antibody. Computer artwork of an antibody (Y-shaped) on the surface of a cell. These Y-shaped immunoglobulin molecules have two arms equipped with binding sites that recognise and bind only to specific antigens, such as viral or bacterial proteins. In doing this they mark the antigen for destruction by phagocyte white blood cells. Although the general structure of all antibodies is very similar, the variable domains allow millions of antibodies with slightly different antigen binding sites, to exist.
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