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)
| 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% |