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

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

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Antibody
The secretary component of sIgA is

added to dimeric IgA by the M cell
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

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