title: Plaque-forming cells in man.
mesh_terms: D000368:Aged; D001402:B-Lymphocytes / Q000276:immunology; D002648:Child; D002675:Child, Preschool; D005615:Freezing; D006462:Hemolytic Plaque Technique; D006801:Humans; D007107:Immune System / Q000502:physiology; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000166:cytology; D012016:Reference Values; D013156:Splenectomy