SNAI1 and breast cancer: A recent study ontransgenic mouse models of breast cancer, MMTV-PyMT, showed that although CSCsand normal breast stem cells are phenotypically similar, they form in differentparts of the breast epithelium (luminal and basal epithelial regions,respectively) and also differ in terms of the molecular mechanisms of EMTactivation (using the transcription factors Snail and Slug, respectively).