title: Host defense mechanisms in the gastrointestinal tract.
mesh_terms: D002648:Child; D004064:Digestive System / Q000276:immunology*; D005260:Female; D005769:Gastrointestinal Motility; D006801:Humans; D007109:Immunity; D007071:Immunoglobulin A, Secretory; D007073:Immunoglobulin E; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007153:Immunologic Deficiency Syndromes / Q000276:immunology; D007231:Infant, Newborn; D007234:Infant, Premature; D007419:Intestinal Secretions; D007422:Intestines / Q000382:microbiology; D008099:Liver / Q000502:physiology; D009748:Nutrition Disorders / Q000276:immunology; D011247:Pregnancy; D013270:Stomach / Q000502:physiology
chemical_list: D007071:Immunoglobulin A, Secretory; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D007073:Immunoglobulin E