Affiliation: | 1. Cancer Center, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA;2. Center for Regenerative Medicine, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA;3. Department of Pathology, Massachusetts General Hospital, 185 Cambridge Street, Boston, MA 02114, USA;4. Harvard Stem Cell Institute, 1350 Massachusetts Avenue, Cambridge, MA 02138, USA;5. Wellcome Trust-Medical Research Council Cambridge Stem Cell Institute, University of Cambridge, Tennis Court Road, Cambridge CB2 1QR, UK;6. Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1QR, UK;7. Howard Hughes Medical Institute and Department of Stem Cell and Regenerative Biology, 7 Divinity Avenue, Cambridge, MA 02138, USA |