Answer / biomaster

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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