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Paradoxical localization of CD45 and vimentin in FFPE malignant lymphoma tissue. (a): H&E, (b): vimentin and (c): CD45 (leukocyte common antigen: LCA). Vimentin is positive in the peripheral zone but negative in the poorly fixed central area (stars). A reversed pattern is recognizable for CD45 localization. The over-fixed outer zone is negative for CD45.
