____ is frequently found on the surface of B cells co-expressed with ____. These two classes are co-expressed not by class switching but by alternative processing of a primary RNA transcript. Both molecules expressed on the single mature B cell have the same binding specificity for antigen.
a) IgA & IgG
b) IgD & IgM
c) IgE & IgA
d) IgG & IgM
e) IgM & IgE
a) IgA & IgG
b) IgD & IgM
c) IgE & IgA
d) IgG & IgM
e) IgM & IgE
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