title: Sudden appearance of IgG plaque-forming cells.
mesh_terms: D000818:Animals; D000921:Antibody-Producing Cells / Q000276:immunology*; D002478:Cells, Cultured; D004912:Erythrocytes / Q000276:immunology; D006462:Hemolytic Plaque Technique; D007111:Immunity, Cellular; D007074:Immunoglobulin G / Q000096:biosynthesis*; D051379:Mice; D008807:Mice, Inbred BALB C; D012756:Sheep / Q000276:immunology; D013154:Spleen / Q000166:cytology / Q000276:immunology*
chemical_list: D007074:Immunoglobulin G