title: Late acquisition of a germ line antibody specificity.
mesh_terms: D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn; D000918:Antibody Specificity; D000921:Antibody-Producing Cells / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D002794:Choline / Q000031:analogs & derivatives*; D007136:Immunoglobulins; D051379:Mice; D008807:Mice, Inbred BALB C; D010767:Phosphorylcholine / Q000276:immunology*; D013154:Spleen / Q000276:immunology
chemical_list: D007136:Immunoglobulins; D010767:Phosphorylcholine; D002794:Choline