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Model of the differentiation hierarchy within mammary epithelium. Primary cell surface markers used in the isolation of mouse and human epithelial cell subsets are shown in blue and red, respectively. (ER) ERα. The common progenitor is also referred to as a bipotent progenitor cell. There may be a hierarchy of stem and bipotent progenitor cells. During pregnancy, the alveolar progenitor may exhibit bipotential capacity.
