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Hodgkin lymphomas, negative for IDO: Classic Hodgkin lymphoma, nodular sclerosis type (A–C): axillary lymph node. Classic Hodgkin lymphoma, mixed cellularity (D–F): cervical lymph node. Nodular lymphocyte predominant Hodgkin lymphoma (G–I): cervical lymph node. Some dendritic cells and macrophages show reactivity for IDO protein (A,D,G): IDO stain, ×40; (B,E,H): IDO stain, ×400: (C,F,I): H&E stain, ×400.
