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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 to part of a small RNA protein complex known as snRNA (U1-snRNP antibodies). Circulating U1-snRNP antibodies are present in autoimmune connective-tissue diseases, particularly in systemic lupus erythematosus and other related diseases.
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