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Double immunofluorescence was performed on the ST of four patients with RA (table 1; patients Nos 1, 2, 3, and 10). (A) STAT1 (tetramethylrhodamine) and CD22+ B cells, CD3+ T cells, CD55+ fibroblast-like synoviocytes, or CD68+ macrophages (fluorescein). No counterstaining was performed. (Original magnification x400.) (B) Percentage STAT1+ cells of, respectively, total CD22+, CD3+, CD55+, or CD68+ cells. Bars represent mean (SD) (n = 4).
