title: In vitro primary response in microcultures containing less than fifty thousand lymphoid cells.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000921:Antibody-Producing Cells; D000956:Antigens, Viral; D002478:Cells, Cultured; D003090:Coliphages / Q000276:immunology; D006462:Hemolytic Plaque Technique; D007075:Immunoglobulin M; D066298:In Vitro Techniques; D008214:Lymphocytes / Q000276:immunology*; D051379:Mice; D008809:Mice, Inbred C3H; D009500:Neutralization Tests; D013154:Spleen / Q000276:immunology
chemical_list: D000956:Antigens, Viral; D007075:Immunoglobulin M