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BCL-2 expression in ALCL of T/null lineage. A: Absence of BCL-2 immunoreactivity in an ALK+ ALCL. Reactive small lymphocytes stained positively and served as internal positive controls. B: A case of ALK− ALCL with strong cytoplasmic staining for BCL-2 in the majority of large tumor cells (DAB, hematoxylin counterstain; original magnification, ×400).
