Breast epithelial cells from the normal breast contain multiple cell types and show inter-individual heterogeneity. A) Breast epithelial cells isolated from the normal breasts of five clinically healthy women show inter-individual differences in staining patterns with CD49f, CD44, CD24, CD90, CD73, and EpCAM antibodies. B) The culturing method enriches for rare endogenous pluripotent somatic stem cells based on CD73/CD90/EpCAM staining patterns. EpCAM expression was seen in greater than 96% of CD73+/CD90- cells in KTB205.