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BCL-XS expression in ALCL of T/null lineage. A: Many BCL-XS-positive tumor cells in an ALK+ ALCL. However, a small number of large anaplastic cells are BCL-XS-negative. B: Rare BCL-XS-positive tumor cells in a case of ALK− ALCL (DAB, hematoxylin counterstain; original magnification, ×400).
