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The gastrointestinal tract represents a natural barrier to environmental pathogens. The gut-associated lymphoid tissue (GALT) provides protection and interacts with the external environment, e.g. bacteria and food antigens. Large numbers of leukocytes are present as aggregates in the lymphoid follicles and as single cells in the lamina propria and epithelium.Intraepithelial T lymphocytes are localized...
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