[1] Brigham & Womens Hosp, Dept Pathol, Lab Syst Biol, Ctr Excellence Vasc Biol, Boston, MA 02115 USA
[2] Harvard Univ, Sch Med, Program Dev & Regenerat Biol, Boston, MA USA
[3] Harvard Univ, Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[4] Harvard Univ, Harvard Stem Cell Inst, Cambridge, MA 02138 USA