Antibody
Antigen binding sites of an immunoglobulin are located in

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

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

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