Hematopoietic reconstitution potential of EPCR-positive cells and other purified stem cell populations. (A) Competitive repopulation experiments showing the contribution to blood chimerism made by indicated numbers of cells purified by different methods (n = 4 to 12 mice per group). (B) Kinetics of 1000 HSC engraftment of mice shown in panel A over the course of study. Error bars represent standard deviation.