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The darkly stained structures in this photomicrograph are keratin 19 (K19)‐positive. On the right side, there is a cirrhotic nodule virtually surrounded by K19‐positive ductular cells, whereas the tumor on the left of the photomicrograph has no K19 ductular reaction around the edges. For further description, see Ref.7. Anti‐K19 immunohistochemistry, magnification ×10.
