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B-cell, T-cell and FDC network staining in TAB and aorta tissue from one patient who experienced C-GCA 5 years before aneurysm surgery. Immunohistochemical stainings show from left to right, CD20+ B-cells, CD3+ T-cells, and no CD21+ FDC network in consecutive sections of a GCA positive TAB (A) and CD20+ B-cells, CD3+ T-cells and a clear CD21+ FDC network in consecutive sections of GCA positive aorta (B).
