Cited2 deficiency results in elevated HSC apoptosis. (A) Representative plots of cells undergoing apoptosis (annexin V+ DAPI−) within LSK (top panel) and CD34− LSK (bottom panel) fractions. (B) Summary data of apoptotic cells shown as means ± SEM (n = 4). (C) Relative expression of Puma in LSK cells (means ± SEM, n = 4). WT indicates wild-type.