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Composite photomicrograph from case 2 tonsillectomy. Composite photomicrograph from case 2 tonsillectomy showing (a) tonsil (H&E 20×) with follicular and MZH showing intact architecture and well polarized follicles. (b) CD20 immunohistochemistry (20×) showing B cell enrichment of follicles. (c and d) show the same follicle (100×) having lambda light chain predominance (d), including many dark zone B cells having diffuse lambda reactivity without as much kappa (c).
