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Medical Definition of Aggregated lymphatic nodules
1. Lymphoid organs located in the sub mucosal tissue of the mammalian gut containing very high proportions of IgA secreting precursor cells. The patches have B and T dependent regions and germinal centres. A specialised epithelium lies between the patch and the intestine. Involved in gut associated immunity. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)