Nonaka, S In vitro IgM rheumatoid factor production by peripheral blood mononuclear cells from patients with seronegative rheumatoid arthritis. [electronic resource] - The Journal of rheumatology Sep 1993 - 1478-84 p. digital Publication Type: Journal Article ISSN: 0315-162X Subjects--Topical Terms: AdultAgedAntigens, CD--analysisArthritis, Rheumatoid--bloodB-Lymphocytes--immunologyCD5 AntigensCells, CulturedFemaleHumansImmunoglobulin G--bloodImmunoglobulin M--bloodMaleMiddle AgedMonocytes--metabolismPokeweed Mitogens--pharmacologyProstaglandin Antagonists--pharmacologyRheumatoid Factor--bloodStaphylococcus aureus--immunologyStem Cells--immunology