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Identification of cell subtypes in germinal centers. (A) Haematoxylin and eosin staining, (B) CD21 staining for follicular dendritic cells, (C) CD3 staining for T cells and (D) CD20 staining for B cells of in human tonsil tissues (magnification, ×50 and ×100; scale bars, 400 and 200 µm, in the upper and lower panel, respectively).
