Antigen absorption by the gut.
D000042:Absorption; D000818:Animals; D000937:Antigen-Antibody Reactions; D000941:Antigens / Q000276:immunology*; D001692:Biological Transport; D005512:Food Hypersensitivity / Q000209:etiology; D006801:Humans; D007108:Immune Tolerance; D007070:Immunoglobulin A; D007413:Intestinal Mucosa / Q000166:cytology / Q000276:immunology*; D008198:Lymph Nodes / Q000166:cytology; D008214:Lymphocytes / Q000276:immunology; D051379:Mice; D051381:Rats
D000941:Antigens; D007070:Immunoglobulin A