Arthritis, RheumatoidComplement C3Complement C4ArthritisComplement C4aComplement C1qComplement C3aComplement ActivationComplement C5aComplement C4bComplement C5Arthritis, ExperimentalComplement C3bComplement System ProteinsComplement C6Complement C3cComplement C3dComplement C2Arthritis, InfectiousSynovial MembraneComplement C9Receptors, ComplementAntirheumatic AgentsComplement C1sArthritis, JuvenileSynovial FluidRheumatoid FactorComplement Membrane Attack ComplexComplement C1rComplement Inactivator ProteinsArthritis, PsoriaticComplement C7Complement C3-C5 ConvertasesJointsComplement Factor BComplement Pathway, AlternativeComplement Pathway, ClassicalComplement C1Complement C8Arthritis, ReactiveSynovitisReceptors, Complement 3bOsteoarthritisComplement Factor HMethotrexateComplement C5bComplement Activating EnzymesImmunoglobulin GComplement C2aReceptor, Anaphylatoxin C5aAutoantibodiesBlood SedimentationSeverity of Illness IndexComplement Hemolytic Activity AssayComplement Inactivating AgentsPeptides, CyclicComplement C1 Inactivator ProteinsReceptors, Complement 3dSulfasalazineRheumatoid NoduleMetacarpophalangeal JointAntibodies, MonoclonalAnaphylatoxinsTumor Necrosis Factor-alphaLupus Erythematosus, SystemicGold Sodium ThiomalateMice, Inbred DBAArthrographyRheumatologyComplement Fixation TestsAntigen-Antibody ComplexRheumatic DiseasesHLA-DRB1 ChainsWrist JointComplement Factor DFinger JointHLA-DR AntigensHLA-DR4 AntigenEnzyme-Linked Immunosorbent AssayCollagen Type IIComplement Factor IComplement C4b-Binding ProteinBiological MarkersTreatment OutcomeCitrullineImmunoglobulin MCells, CulturedSpondylitis, AnkylosingComplement C3b Inactivator ProteinsAntigens, CD55Autoimmune DiseasesReceptors, Tumor Necrosis FactorArthritis, GoutyAntigens, CD59Complement C3-C5 Convertases, Classical PathwayComplement C2bMolecular Sequence DataOrganogold CompoundsFoot JointsCase-Control Studies