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The life of a mucosal T or B cell begins in the thymus and bone marrow.

Naive lymphocytes enter the Peyer's patches expressing CCR7, which will bind to
Select Option CCL19 and CCL21 CD4 and CD8 IL-2 and IL-5
. If they bind antigen in the GALT, lymphocytes will lose expression of CCR7 and begin expressing
Select Option $\alpha$4:$\beta$1 integrin $\alpha$4:$\beta$7 integrin $\alpha$7:$\beta$2 integrin
, which interacts with MAdCAM-1 in vessels of the wall.
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