title: Antigen-initiated B lymphocyte differentiation. XV. Existence of "pre-progenitor" and "direct progenitor" subsets among secondary B cells.
mesh_terms: D000818:Animals; D000921:Antibody-Producing Cells / Q000276:immunology*; D000941:Antigens; D001402:B-Lymphocytes / Q000276:immunology*; D000939:Epitopes; D005408:Flagellin / Q000276:immunology; D007074:Immunoglobulin G / Q000096:biosynthesis; D007075:Immunoglobulin M / Q000096:biosynthesis; D007156:Immunologic Memory; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008808:Mice, Inbred CBA; D009578:Nitrobenzenes / Q000276:immunology; D013997:Time Factors
chemical_list: D000941:Antigens; D000939:Epitopes; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D009578:Nitrobenzenes; D005408:Flagellin