1. From the Center for Systems Biology and Radiology Department (G.C., V.F., L.H., F.H., M.J.S., Y.S., C.E., M.H., S.C., D.R., M.J.P., F.K.S., M.N.), Harvard Medical School, Boston
2. Massachusetts General Hospital and Program in Cellular and Molecular Medicine, Boston Children’s Hospital and Department of Pediatrics (J.P.), Harvard Medical School, Boston
3. Center for Regenerative Medicine, Massachusetts General Hospital, Boston (N.S., D.T.S.)
4. Harvard Stem Cell Institute, Cambridge, MA (N.S., D.T.S.)
5. Department of Stem Cell and Regenerative Biology, Harvard University, Cambridge, MA (N.S., D.T.S.)
6. Molecular Imaging and Neurovascular Research Laboratory, Department of Neurology, Dongguk University College of Medicine, Goyang, South Korea (D.-E.K.).
7. Stroke and Neurovascular Regulation Laboratory, Departments of Radiology and Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown (M.A.M.)
8. Cardiovascular Research Center (M.N.), Harvard Medical School, Boston