Antibody
The secretary component of sIgA is

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

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Antibody
Which is not a function of IgG?

First antibody type produced against an antigen during the primary antibody response
Involved in opsonization
Major antibody in serum
Activates or fixes complement

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