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Function. Because the lumen of the gastrointestinal tract is exposed to the external environment, much of it is populated with potentially pathogenic microorganisms. Peyer's patches thus establish their importance in the immune surveillance of the intestinal lumen and in facilitating the generation of the immune response within the mucosa.
The components of MALT are sometimes subdivided into the following: 1  GALT (gut-associated lymphoid tissue. 2  Peyer's patches are a component of GALT found in the lining of the small intestines 3  .). BALT (bronchus-associated lymphoid tissue).ALT plays a role in regulating mucosal immunity. It may be the site of lymphoma, usually non-Hodgkin lymphoma. A specific entity is the MALT lymphoma linked to Helicobacter pylori in the stomach.