Mammary Stem Cells (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption This is a section of a normal mammary gland that has been stained to find the terminal duct zones that are enriched for mammary stem cells (red) and to visualize a Notch signaling pathway (green). Impairing the Notch pathway caused malignant breast cancer cells to revert to a normal phenotype. Credit Mark LaBarge Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.