Frequency of different types of progenitors in WT SCL- and DN SCL-transduced HSCs. Progenitor types were determined by analyzing the cells generated from a single cell. Results of 2 independent experiments (A-B) are shown. Asterisks indicate the wells in which the indicated type of progenitor was undetectable. At least 3000 hematopoietic cells per well were analyzed using FACS.