49. Antibodies of the different classes IgM, IgG, IgA, IgD and IgE differ from each other in
(A) the way they are produced.
(B) the type of cell that produces them.
(C) the way they interact with the antigen.
(D) the antigenic determinants that they recognize.
(E) the number of carbohydrate subunits they have.
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