title: The respiratory tract immune system in the pig. II. associated lymphoid tissues.
abstract: The distribution of immunoglobulins A, G and M were assessed in the bronchial lymph node and palantine tonsil of pigs from birth to maturity, using the immunoperoxidase technique. Immunoglobulin-containing cells appeared earlier in the tonsil than in the lymph node; this probably reflects the exposure of the tonsil to environmental antigens. IgG-containing cells predominated after the first 3 weeks of life, but the IgA:IgG ratio was much higher in the tonsil than in the lymph node. Extracellular, reticular staining was visible in the central region of some follicles in addition to a few immunoglobulin-containing cells that resembled large lymphocytes or blast cells.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000921:Antibody-Producing Cells / Q000276:immunology; D001980:Bronchi / Q000276:immunology; D007070:Immunoglobulin A / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D008198:Lymph Nodes / Q000276:immunology; D008221:Lymphoid Tissue / Q000276:immunology*; D014066:Palatine Tonsil / Q000276:immunology; D010950:Plasma Cells / Q000276:immunology; D012137:Respiratory System / Q000276:immunology*; D013552:Swine / Q000276:immunology*
chemical_list: D007070:Immunoglobulin A; D007075:Immunoglobulin M