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A. Active secondary lymphoid follicle. SMZL and hyperplasia follicular area. Hematoxilin-eosin. B. FDCs pattern type 1. Primary lymphoid follicle. Follicular hyperplasia. CD21. C. FDCs pattern type 2. Small GC and wide MZ phase. Follicular hyperplasia. CD21. D. Follicle with small GC and wide MZ phase. Follicular hyperplasia. CD21. E. FDCs pattern type 3. SMZL. CD21. F. FDCs meshwork invaded by cells belonging to SMZL. SMZL. CD21.
