Lupus Erythematosus, SystemicArthritis, RheumatoidArthritisLupus Erythematosus, DiscoidLupus Erythematosus, CutaneousLupus NephritisAntibodies, AntinuclearAutoantibodiesArthritis, ExperimentalArthritis, InfectiousAntirheumatic AgentsSynovial MembraneArthritis, JuvenileLupus Vasculitis, Central Nervous SystemRheumatoid FactorSynovial FluidHydroxychloroquineImmunoglobulin GArthritis, PsoriaticAutoimmune DiseasesSeverity of Illness IndexRheumatic DiseasesJointsAutoantigensArthritis, ReactiveAntibodies, AnticardiolipinMice, Inbred NZBBlood SedimentationAntigen-Antibody ComplexSynovitisOsteoarthritisAntibodies, AntiphospholipidMethotrexateAntiphospholipid SyndromeSjogren's SyndromeComplement C4PrednisoloneAutoimmunityMice, Inbred MRL lprCase-Control StudiesEnzyme-Linked Immunosorbent AssayImmunoglobulin MGenetic Predisposition to DiseaseAntibodies, MonoclonalB-LymphocytesLupus Coagulation InhibitorRheumatologyImmunosuppressive AgentsBiological MarkersConnective Tissue DiseasessnRNP Core ProteinsComplement C1qTumor Necrosis Factor-alphaHLA-DRB1 ChainsPanniculitis, Lupus ErythematosusComplement C3HLA-DR AntigensSulfasalazineT-LymphocytesRheumatoid NoduleMetacarpophalangeal JointTreatment OutcomeNephritisCollagen DiseasesGold Sodium ThiomalatePhotosensitivity DisordersArthrographyB-Cell Activating FactorDNARNA, Small CytoplasmicMice, Inbred DBAPeptides, CyclicVasculitisGlucocorticoidsAnti-Inflammatory AgentsScleroderma, SystemicWrist JointSpondylitis, AnkylosingMixed Connective Tissue DiseaseAntibody SpecificityHLA-DR4 AntigenCardiolipinsDrug Therapy, CombinationCohort StudiesDisease Models, AnimalSerositisCells, CulturedReceptors, Tumor Necrosis FactorPolymorphism, Single NucleotideComplement C4aAntibodiesGenotypeFinger JointAdrenal Cortex HormonesLymphocyte ActivationCytokinesCitrullineComplement System ProteinsReceptors, IgGProtein Tyrosine Phosphatase, Non-Receptor Type 22