Lymphoid tissue located beneath the mucosal epithelia, mucosa-associated lymphoid tissue (MALT), protects the body against pathogens that may enter the body via the mucosa
Often MALT consists of small accumulations of lymphoid cells or one to a few lymph follicles beneath the epithelium and possibly extending into the submucosa. The tonsils and Peyer's patches are large accumulations of lymphoid tissue with associated specialisations of the epithelium.
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