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B-cell lymphomas with low IDO expression: Follicular lymphoma, grade 1–2 (A), ×40. Follicular lymphoma, grade 3B showed positivity in the centroblasts of follicles and the diffuse patterned areas (B), ×40; Insert: ×400. MALT lymphoma (C), ×100. Mantle cell lymphoma (D), ×40. Chronic lymphocytic leukemia/small lymphocytic lymphoma (E), ×40. B-lymphoblastic lymphoma/leukemia (F), ×40.
