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Immunofluorescent staining for CD9 in the germinal centers of human tonsils. The frozen tonsillar tissue sections were stained with anti-CD9 (A–C, red) in combination with anti-CD23 (A, green), anti-CD54 (B, green), and anti-Ki67 (C, green). (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
