CD24 and breast cancer: FACS analysis revealed that regenerated p18mt;Gata3+/- mammary tumors were composed of predominantly (81%) CD24+CD29high cells, previously demonstrated as CSC-enriched cell populations 56, 57, while regenerated p18mt tumors were composed of predominantly (75%) CD24+CD29low luminal/epithelial cells (Figure 4G), which was also detected in primary p18mt tumors 20.