van Os R, de Haan G, Dykstra BJ
Cell Stem Cell 2009 Jan;4(1):7-8
p53, sometimes referred to as the “guardian of the genome,” helps regulate cell-cycle arrest, DNA-damage repair, apoptosis, and senescence. Adding to this list, in this issue of Cell Stem Cell, Liu et al. (2009) show that p53 also plays a role in regulating hematopoietic stem cell quiescence.