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Immunohistochemical double labelling of the ST of four patients with RA (table 1; patients Nos 4, 5, 7, and 13; representative sections are shown) for STAT1 and CD22+ B cells (A), CD3+ T cells (B), CD55+ fibroblast-like synoviocytes (C), or CD68+ macrophages (D). STAT1 was detected using aminoethylcarbazole as dye (red) and CD molecules were detected using AP substrate (blue); no counterstaining was performed (see "Materials and methods"). (Original magnificationx400.)
