1 Department of Cancer Biology, Dana Farber Cancer Institute, Boston, MA, USA.
2 Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
3 Department of Neurobiology, Howard Hughes Medical Institute, Harvard Medical School, Boston, MA, USA.
4 Division of Endocrinology, Diabetes and Metabolism, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
5 Program in Neuroscience, Harvard Medical School, Boston, MA, USA.
6 Department of Cancer Biology, Dana Farber Cancer Institute, Boston, MA, USA. bruce_spiegelman@dfci.harvard.edu.
7 Department of Cell Biology, Harvard Medical School, Boston, MA, USA. bruce_spiegelman@dfci.harvard.edu.