Antibody
Antigen binding sites of an immunoglobulin are located in

Fc region of the antibody
light chain alone
Fab regions of the antibody
heavy chain alone

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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
made by T cells
added to dimeric IgA by the M cell
made by plasma cells that secrete dimeric IgA

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