Figure 1From: Cytogenetic characterization and H-ras associated transformation of immortalized human mammary epithelial cellsa. Photomicrograph displays a hematoxylin/eosin section (of a section of the mammary epithelial tumor at 40×). b. This same section at 200×. c. The pan-cytokeratin stain (AE1/AE3) is strongly positive, confirming the epithelial nature of the tumor. Magnification is 200×.Back to article page