What are the classes of antibodies?
There are five immunoglobulin classes (isotypes) of antibody molecules found in serum: IgG, IgM, IgA, IgE, and IgD.
IgA (immunoglobulin A)
IgD (immunoglobulin D)
IgE (immunoglobulin E)
IgG (immunoglobulin G)
IgM (immunoglobulin M)