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Rheumatoid FactorRheumatoid Factor
Rheumatoid factors are proteins found in the blood. These proteins, which also are called antibodies or immunoglobulins, are produced by white blood cells (lymphocytes) in the immune system to help the body neutralize harmful substances (antigens), such as viruses and bacteria, and fight disease. There are three types of rheumatoid factors: IgM-rheumatoid factor (IgM RF), IgG-rheumatoid factor (IgG RF), and IgA-rheumatoid factor (IgA RF). Most, but not all, patients with...Read the full article
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