title: Thymic involution and ageing.
mesh_terms: D000375:Aging; D000818:Animals; D000917:Antibody Formation; D003429:Cross Reactions; D004926:Escherichia coli / Q000276:immunology; D007070:Immunoglobulin A / Q000096:biosynthesis; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D008070:Lipopolysaccharides; D051379:Mice; D011134:Polysaccharides; D011135:Polysaccharides, Bacterial; D012756:Sheep; D013296:Streptococcus pneumoniae / Q000276:immunology; D013950:Thymus Gland / Q000502:physiology*
chemical_list: D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D008070:Lipopolysaccharides; D011134:Polysaccharides; D011135:Polysaccharides, Bacterial