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Immunohistochemistry of ALK‐positive anaplastic large cell lymphoma (ALCL) tumor tissues. Tumor biopsies of ALCL were analyzed sequentially with (a) hematoxylin and eosin, and with (b) anti‐CD30, (c) anti‐ALK, (d) anti‐Bcl‐3 and (e) anti‐p52 monoclonal antibodies. Original magnification, ×400.
