Arthritis, RheumatoidAutoimmune DiseasesArthritisDisease SusceptibilityGenotypeGenetic Predisposition to DiseaseArthritis, ExperimentalArthritis, InfectiousSynovial MembraneArthritis, JuvenilePolymorphism, Single NucleotideAntirheumatic AgentsAllelesRheumatoid FactorPolymorphism, GeneticAutoantibodiesSynovial FluidArthritis, PsoriaticLupus Erythematosus, SystemicHaplotypesJointsGene FrequencyCase-Control StudiesGeneticsAutoimmunityHLA-DRB1 ChainsArthritis, ReactiveGenetic VariationGenome-Wide Association StudyHLA-DR AntigensSynovitisOsteoarthritisPhenotypeLinkage DisequilibriumMethotrexateAutoantigensGenetic MarkersImmunoglobulin GSeverity of Illness IndexGenetic LinkageMice, Inbred DBAGenetics, PopulationChromosome MappingTumor Necrosis Factor-alphaRheumatic DiseasesMolecular Sequence DataBlood SedimentationT-LymphocytesDisease Models, AnimalMice, Inbred C57BLHLA-DQ AntigensDiabetes Mellitus, Type 1CytokinesPolymerase Chain ReactionAntibodies, MonoclonalSulfasalazineSpondylitis, AnkylosingRheumatoid NoduleMetacarpophalangeal JointMutationSjogren's SyndromePeptides, CyclicGold Sodium ThiomalateModels, GeneticAntibodies, AntinuclearRisk FactorsImmunity, InnateEncephalomyelitis, Autoimmune, ExperimentalMicrobial Sensitivity TestsArthrographyGenome, HumanEpistasis, GeneticCells, CulturedRheumatologyGenetic Association StudiesHLA-DR4 AntigenGenetic LociHLA-DQ beta-ChainsCohort StudiesHLA AntigensLymphocyte ActivationTreatment OutcomeWrist JointSequence Analysis, DNAHLA-DR3 AntigenCrohn DiseaseBiological MarkersProtein Tyrosine Phosphatase, Non-Receptor Type 22Collagen Type IIInflammationQuantitative Trait LociMicrosatellite RepeatsBase SequenceMice, KnockoutReceptors, Tumor Necrosis FactorComplement C4aGenes, MHC Class IIRats, Inbred LewB-LymphocytesFinger Joint