title: Host defense factors in the gastrointestinal tract.
mesh_terms: D001402:B-Lymphocytes / Q000276:immunology; D002648:Child; D004064:Digestive System / Q000276:immunology*; D004848:Epithelium / Q000276:immunology; D005759:Gastroenteritis / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D006801:Humans; D007108:Immune Tolerance; D007111:Immunity, Cellular; D007136:Immunoglobulins / Q000378:metabolism; D007413:Intestinal Mucosa / Q000276:immunology; D007419:Intestinal Secretions / Q000276:immunology; D008198:Lymph Nodes / Q000276:immunology; D010581:Peyer's Patches / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000949:Histocompatibility Antigens Class II; D007136:Immunoglobulins