Cyclin D3 in splenic B‐cell lymphomas. (A-B) 3,3′-diaminobenzidine (DAB) immunostaining of a cyclin D3-positive SDRPL case. Original magnification ×4 (A) and ×20 (B). (C) DAB immunostaining of a cyclin D3‐negative SMZL case. Original magnification ×40. (D) FISH staining with a cyclin D3 break-apart probe. DNA nuclei were stained with 4′,6-diamidino-2-phenylindole. Original magnification ×100. (E) Number of splenic B-cell lymphoma cases studied by cyclin D3 immunohistochemistry, CCND3 sequencing, and FISH analysis.