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The mucosa-associated lymphoid tissue (MALT) (also called mucosa-associated lymphatic tissue) is a diffuse system of small concentrations of lymphoid tissue found in various sites of the body, such as the gastrointestinal tract, thyroid, breast, lung, salivary glands, eye, and skin. MALT is populated by lymphocytes such as T cells and B cells, as well as plasma cells and macrophages, each of which is well situated to encounter antigens passing through the mucosal epithelium. In the case of intestinal MALT, M cells are also present, which sample antigen from the lumen and deliver it to the lymphoid tissue. ==Categorisation== The components of MALT are sometimes subdivided into the following: * GALT (gut-associated lymphoid tissue. Peyer's patches are a component of GALT found in the lining of the small intestines.) * BALT (bronchus-associated lymphoid tissue) * NALT (nasal-associated lymphoid tissue) * CALT (conjunctival-associated lymphoid tissue) * O-MALT (organized mucosa-associated lymphatic tissue); specifically, the tonsils of Waldeyer's tonsillar ring are O-MALT.〔Gray's Anatomy, 38ed. p. 1442 ff.〕 * D-MALT (diffuse mucosa-associated lymphatic tissue); MALT that is not organized as a separately macroscopically anatomically identifiable mass, tissue or organ (such as the aforementioned O-MALT) is diffuse MALT.〔 * LALT (larynx-associated lymphoid tissue) * SALT (skin-associated lymphoid tissue) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mucosa-associated lymphoid tissue」の詳細全文を読む スポンサード リンク
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