?: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 antibodies directed against nuclear antigens (i.e., antinuclear antibodies [ANA]). Increased ANA circulating levels are associated with autoimmune connective-tissue diseases, such as systemic lupus erythematosus, scleroderma, and rheumatoid arthritis.
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