Antibody
The secretary component of sIgA is

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

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Antibody
Which is not a function of IgG?

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

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