?: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 (termed SS-B or SS-B/La) to an RNA/protein complex (an extractable nuclear antigen). Circulating SS-B antibodies are present in autoimmune connective-tissue diseases, particularly in Sjogren\'s syndrome which is characterized by keratoconjunctivitis and xerostomia.
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