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Increased proportion relative to B-lymphocytes of a subset of B lymphocytes characterized by dim/low levels of CD21, i.e., CD21-/low, in flow cytometry, and additionally enriched in autoreactive clones as determined for instance by clonse showing rheumatoid factor (anti-IgG) reactivity and antibodies recognizing cytoplasmic and to a lesser extent nuclear structures. [PMID:26119182]
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