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(a) H&E, high power view of bone marrow core needle biopsy with diffuse lymphoid infiltrate; (b) CD20 highlights B-cell lineage of lymphoid infiltrate; (c) CD5 expression is not seen in the neoplastic lymphoid population; (d) H&E: intermediate power view of clot section with diffuse lymphoid infiltrate; (e) BCL-1 (cyclin D1) is expressed by the neoplastic lymphoid population; (f) Ki-67 indicates a low proliferation rate in MCL.
