HypergammaglobulinemiaAutoimmune DiseasesMurine Acquired Immunodeficiency SyndromeSplenomegalyLymphatic DiseasesAleutian Mink DiseaseB-LymphocytesLupus VulgarisAutoantibodiesGiant Lymph Node HyperplasiaHepatitis, AutoimmuneHepatomegalyAntibodies, AntinuclearImmunoglobulin GLupus Erythematosus, SystemicAleutian Mink Disease VirusCoombs TestSjogren's Syndromegamma-GlobulinsLymphoproliferative DisordersLymphocyte ActivationImmunoglobulinsPlasma CellsPrednisoloneT-LymphocytesLeishmaniasis, VisceralSpleenMice, Inbred C57BLAutoimmunityImmunoglobulin MMice, KnockoutAutoantigensEncephalomyelitis, Autoimmune, ExperimentalKidneyAutoimmune Diseases of the Nervous SystemMice, Inbred MRL lpr