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To reach target antigens in the gut lumen, IgA produced in the tissue must be transported across the endothelium.

This is accomplished by

A

secretory IgA passing through the tight junctions.

B

B cells directly crossing the epithelial barrier.

C

epithelial cells expressing polymeric immunoglobulin receptor.

D

dendritic cells pushing IgA through the epithelium on their processes.

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