Antibody
Which of the following theory of antibody production is most widely accepted?

Side chain theory
Indirect template theory
Direct template theory
Clonal selection theory

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

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