Lupus Erythematosus, SystemicAntibodies, AntinuclearLupus NephritisLupus Erythematosus, DiscoidLupus Erythematosus, CutaneousAutoantibodiesLupus Vasculitis, Central Nervous SystemAntibodies, AnticardiolipinMice, Inbred NZBHydroxychloroquineAntiphospholipid SyndromeAutoantigensAutoimmune DiseasesAntibodies, AntiphospholipidLupus Coagulation InhibitorImmunoglobulin GComplement C4Mice, Inbred MRL lprsnRNP Core ProteinsAntigen-Antibody ComplexRheumatic DiseasesAutoimmunityArthritis, RheumatoidSjogren's SyndromeNephritisComplement C1qSeverity of Illness IndexComplement C3B-LymphocytesPrednisoloneRNA, Small CytoplasmicConnective Tissue DiseasesDNAImmunoglobulin MImmunosuppressive AgentsCase-Control StudiesEnzyme-Linked Immunosorbent AssayGenetic Predisposition to DiseaseB-Cell Activating FactorCardiolipinsCollagen DiseasesPhotosensitivity DisordersComplement C4aMixed Connective Tissue DiseaseSerositisScleroderma, SystemicLupus VulgarisRibonucleoproteins, Small NuclearRibonucleoproteinsComplement System ProteinsBiological MarkersGlomerulonephritisbeta 2-Glycoprotein IVasculitisAntibody SpecificityCryoglobulinsPanniculitis, Lupus ErythematosusT-LymphocytesReceptors, IgGAdrenal Cortex HormonesProteinuriaPlasmapheresisMethylprednisoloneB-Lymphocyte SubsetsInterferon Regulatory FactorsAzathioprinePolymorphism, Single NucleotideComplement C4bMyelitis, TransverseAntibodiesComplement C2PrednisoneLymphocyte ActivationAntibodies, MonoclonalAntibodies, Anti-IdiotypicGlucocorticoidsRisk FactorsGenotypeEuropean Continental Ancestry GroupKidneyAnemia, Hemolytic, AutoimmuneInterferon-alphaHaplotypesReceptors, Complement 3bFlow CytometryTumor Necrosis Factor Ligand Superfamily Member 13Cohort StudiesBlood SedimentationAllelesPolymorphism, GeneticDisease Models, AnimalGene FrequencyComplement C3cThrombocytopeniaKidney GlomerulusLeukocytes, MononuclearRheumatoid FactorLymphocytesImmunoglobulin IdiotypesSkin Diseases