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BCL-XL expression in ALCL of T/null lineage. A: Absence of BCL-XL expression in a case of ALK+ ALCL with skin involvement. Co-existing skin adnexal structures are weakly positive for BCL-XL. B: High expression levels of BCL-XL in an ALK− ALCL. A small number of reactive small lymphocytes show weak cytoplasmic immunoreactivity for BCL-XL (DAB, hematoxylin counterstain; original magnification, ×400).
