expression. Whereas CCL19, CXCL12, CCL21 and CCL28 messenger RNAs were similarly expressed in both mucosae, CCL25 messenger RNA was only expressed in the small intestine. Thus, the nasal and small intestine mucosae represent separate compartments for infiltration by CD3 + T cells and sIgA + effector cells, with the exception of a population of small intestine activated sIgA + cells, which may gain access to both mucosae.
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