Antibody
Which is not a function of IgA?

Agglutinate antigen
Protect mucosal surfaces
Fix complement
Protect eyes

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Antibody
The secretary component of sIgA is

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
added to dimeric IgA by the M cell
made by T cells

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