Antibody
Simulation of which of the following will lead to appearance of first antibody to appear following stimulation by an antigen?

IgM
IgA
IgG
IgE

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Antibody
The secretary component of sIgA is

added to dimeric IgA by the M cell
made by plasma cells that secrete dimeric IgA
formed by cleavage of an epithelial cell receptor used to transport the dimeric IgA across the epithelial cell
made by T cells

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