title: Gastrointestinal structure and function in germ-free or gnotobiotic animals.
mesh_terms: D000818:Animals; D002432:Cecum / Q000033:anatomy & histology; D004064:Digestive System / Q000033:anatomy & histology* / Q000276:immunology; D004068:Digestive System Physiological Phenomena; D005856:Germ-Free Life; D006168:Guinea Pigs; D007136:Immunoglobulins / Q000032:analysis; D007408:Intestinal Absorption; D007421:Intestine, Small / Q000033:anatomy & histology; D051379:Mice; D051381:Rats; D013552:Swine
chemical_list: D007136:Immunoglobulins