Antibody - Structure, Classes, Function | Britannica
https://www.britannica.com/science/antibody/Antibody-structure-and-classes
WEBclasses of antibodies. The five main classes of antibodies (immunoglobulins): IgG, IgA, IgD, IgE, and IgM. (more) Antibodies are grouped into five classes according to their constant region. Each class is designated by a letter attached to an abbreviation of the word immunoglobulin: IgG, IgM, IgA, IgD, and IgE.
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