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Figure 3 Anaplastic lymphoma kinase (ALK) expression in tumour biopsies of a patient with systemic nodal anaplastic large cell lymphoma (A) and a cutaneous relapse (B). Brown cytoplasmic and nuclear staining of the tumour cells indicates ALK expression, as detected by the monoclonal antibody ALK1. Haematoxylin counterstaining; original magnification, x400.
