The spleen and lymphocytes.
D000818:Animals; D000917:Antibody Formation; D001402:B-Lymphocytes / Q000276:immunology*; D002465:Cell Movement; D002470:Cell Survival; D003601:Cytotoxicity Tests, Immunologic; D004247:DNA / Q000096:biosynthesis; D006649:Histocompatibility Antigens; D007111:Immunity, Cellular; D008196:Lymph / Q000166:cytology; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000528:radiation effects; D051379:Mice; D010761:Phosphorus Radioisotopes; D011828:Radiation Chimera; D011830:Radiation Effects; D051381:Rats; D013154:Spleen / Q000166:cytology* / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*; D013897:Thoracic Duct; D013936:Thymidine / Q000378:metabolism; D014316:Tritium; D014529:Uridine / Q000378:metabolism
D006649:Histocompatibility Antigens; D010761:Phosphorus Radioisotopes; D014316:Tritium; D004247:DNA; D013936:Thymidine; D014529:Uridine