Immune system of the gastrointestinal tract.
D000818:Animals; D001659:Biliary Tract / Q000276:immunology; D004064:Digestive System / Q000033:anatomy & histology / Q000276:immunology*; D005767:Gastrointestinal Diseases / Q000276:immunology; D006801:Humans; D007071:Immunoglobulin A, Secretory / Q000276:immunology; D008099:Liver / Q000033:anatomy & histology / Q000276:immunology; D008214:Lymphocytes / Q000166:cytology / Q000276:immunology; D008221:Lymphoid Tissue / Q000033:anatomy & histology / Q000276:immunology; D051379:Mice; D051381:Rats
D007071:Immunoglobulin A, Secretory