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(a, b, c, d)- Sections of an activated B-cell like (ABC) diffuse large B-cell lymphoma (DLBCL) case showing (a) H & E staining, and granular membranous and cytoplasmic immunoperoxidase (brown) reactivity in all tumor cells for (b) CD20 antigen, (c) BCL-6 antigen and (d) BCL-2 antigen (all ×400).
