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Medical Definition of Agmen peyerianum
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)