Phenotypic Characterization of Cells Within Subcutaneous Rheumatoid Nodules
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An immunohistochemical double-staining technique was applied to frozen sections of biopsies from subcutaneous rheumatoid nodules. Material within the central necrosis reacted with anti-immunoglobulin and anti-HLA-DR antibodies. Cells within the palisading layer were "macrophage-like," as indicated by staining for anti-HLA-DR and OKM1, and showed a high proliferative activity as seen by OKT9 reactivity. The granulation zone contained many (alpha Leu-1+) T cells in close contact with HLA-DR-expressing non-T cells.
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