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Coexpression of CK19 and AFP in GS5-derived (B) or Huh7.5-derived (A) tumor xenografts. (A, B) Images show staining for CK19 (brown). (C, D) Similar sections were costained for both CK19 (purple) and AFP (brown). The AFP+ CK19+ double-positive cells represent hepatic progenitor-like cells and are indicated with arrows in panel D. These cells are absent in panel C.
