title: Immunological responses and microorganisms indigenous to the gastrointestinal tract.
mesh_terms: D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000921:Antibody-Producing Cells; D000937:Antigen-Antibody Reactions; D000942:Antigens, Bacterial; D001419:Bacteria / Q000276:immunology; D001439:Bacteroides; D004064:Digestive System / Q000382:microbiology*; D005260:Female; D005856:Germ-Free Life; D007109:Immunity; D007136:Immunoglobulins; D007419:Intestinal Secretions / Q000276:immunology; D051379:Mice; D011247:Pregnancy; D013154:Spleen / Q000166:cytology / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D007136:Immunoglobulins