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Table 1 Frequencies of RF-secreting B cells in peripheral blood B cells from normal controls and patients with rheumatoid arthritis (RA) and primary Sjögren’s syndrome (pSS)

From: VH3-21 B Cells Escape from a State of Tolerance in Rheumatoid Arthritis and Secrete Rheumatoid Factor

B Cell Donors Number of Microcultures IgM+ Cultures RF+/IgM+ Cultures
Normal controls (n = 4) 544 149 0.7%
RA patients (n = 5) 2128 439 14.9%
pSS patients (n = 2) 1536 386 12.7%