title: The response of the tonsil and associated lymph nodes of gnotobiotic piglets to the presence of bacterial antigen in the oral cavity.
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial; D001491:Basophils / Q000166:cytology; D004926:Escherichia coli / Q000276:immunology*; D005856:Germ-Free Life; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology*; D008214:Lymphocytes / Q000166:cytology; D009055:Mouth; D009093:Mucus / Q000166:cytology; D014066:Palatine Tonsil / Q000166:cytology / Q000276:immunology*; D013552:Swine
chemical_list: D000942:Antigens, Bacterial