Mice, Inbred NZBAutoantibodiesSpleenNew ZealandMice, Inbred StrainsMice, Inbred C57BLLupus VulgarisLupus Erythematosus, SystemicLupus NephritisMice, CongenicMice, Inbred BALB CAntibodies, AntinuclearCrosses, GeneticAnemia, Hemolytic, AutoimmuneAutoimmune DiseasesCoombs TestB-Lymphocyte SubsetsAutoimmunity