title: Direct evidence for plaque formation by macrophages.
mesh_terms: D000818:Animals; D000917:Antibody Formation; D000921:Antibody-Producing Cells; D002244:Carbon; D004912:Erythrocytes / Q000276:immunology; D005260:Female; D006462:Hemolytic Plaque Technique; D007114:Immunization; D008264:Macrophages / Q000276:immunology*; D008297:Male; D051379:Mice; D008808:Mice, Inbred CBA; D008846:Micromanipulation; D010587:Phagocytosis; D012756:Sheep / Q000276:immunology; D013154:Spleen / Q000166:cytology
chemical_list: D002244:Carbon