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Rutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford.
Rheumatoid Factor (RF) Rheumatoid factor (RF) was the first autoantibody to be discovered in people with RA. (Autoantibodies develop in response to the bodyâs own tissue, and are characteristic of autoimmune diseases, such as RA.) Despite the name, however, RF is not specific to RA, and there are many factors that can impact RF lab results.