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1. Provide barrier function against penetration of infectious and immunogenic componente into the circulation (barriar)
2. Provide protection from harmful microbiaJ pathogens (antl-infoction)
3. Exhibit Iow reactivity to harmless antigens preaent on mucoaal surfaoe (oni or mucoaal
4. Maintain mucosal homeostaw (Immunoregulatory tancSon)