Answer / andy

1. M cells take up antigen.
2. stimulated B cells leave Peyer's patch and travel
through lymph and blood to lamina propria of intestine.
3. In lamina propria B cells differentiate into IgA-
secreting plasma cells.
4. IgA receives protective secretory component.
5. IgA is transported across epithelium to gut to deal with
intraluminal Ag.

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