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Antibodies are proteins produced by plasma cells that bind specifically to antigens, neutralising pathogens or marking them for destruction. Immune memory ensures a faster, stronger response upon re-exposure to the same pathogen. This lesson covers antibody structure, function, classes, and the mechanism of immune memory for the Edexcel A-Level Biology (9BI0) specification.
Antibodies (also called immunoglobulins, abbreviated Ig) are Y-shaped glycoproteins produced by plasma cells (differentiated B cells).
Each antibody molecule consists of:
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