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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