Synovial MembraneArthritis, RheumatoidArthritisArthritis, ExperimentalArthritis, InfectiousArthritis, JuvenileArthritis, PsoriaticArthritis, ReactiveSpecimen HandlingJointsSynovial FluidArthritis, GoutyRheumatoid FactorMice, Inbred DBASynovitisOsteoarthritisCollagen Type IISeverity of Illness IndexMethotrexateSensitivity and SpecificityAutoantibodiesRats, Inbred LewBlood Sedimentation