Antibody
Antigen binding sites of an immunoglobulin are located in

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

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Antibody
The secretary component of sIgA is

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

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