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Non-neoplastic gastric mucosa displaying (a) lymphoid follicle with germinal center (Haematoxylin and Eosin, HE, 100×) (c) with CD20+ lymphocytes (IHC, 100×) and absence of CD138+ plasma cells (e) (IHC, 100×)—Patient 9. (b) Non-neoplastic gastric mucosa displaying a lymphoid follicle without germinal center (HE, 100×) with (d) CD20+ lymphocytes and (f) scattered CD138+ plasma cells at the periphery (arrows)—Patient 4.
