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Immunocytochemical staining showing that the colony-forming cells were consistently positive for the progenitor-specific markers Oval-6 (A), CD90 (F) and CD117 (H); the hepatocyte-specific markers ALB (I), CK18 (B) and CK8 (D); and the cholangiocyte-specific markers CK19 (C). These cells were also positive for two hematopoietic cell markers CD45 (E) and CD109 (G). Original magnification, 20x.
