Ziegler BL, Valtieri M, Porada GA, De Maria R, Müller R, Masella B, Gabbianelli M, Casella I, Pelosi E, Bock T, Zanjani ED, Peschle C. KDR receptor: a key marker defining hematopoietic stem cells. Science. 1999 Sep 03; 285(5433):1553-8.