?:definition
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Immunoassay reagents intended to perform qualitative and/or quantitative analyses on a body fluid sample (e.g., serum) to determine circulating antibodies directed toward the A2hnRNP core protein, known as anti-RA33 antibodies. Determination of anti-RA33 antibodies, combined with the determination of rheumatoid factor antibodies, may be used in the identification of patients at risk of erosive arthritis, especially those patients who suffer from systemic lupus erythematosus.
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