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attached to B cells/free in plasma; serves as an antigen receptor when bound to a B cell; 1st Ig released to plasma by plasma cells; agglutination agent; fixes complement


monomer found in plasma, dimer found in secretions (mucous, tears, saliva, HCL, milk); protects mucosal surfaces from pathogens


attached to B cell; activates B cells


most abundant antibody in plasma; main antibody of primary/secondary responses; crosses placenta; fixes complement


secreted by plasma cells in skin and mucosae; allergic response



IgD, IgG, IgE

Y shaped monomers


monomer or dimer

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