1. From the Department of Medicine, University of Cambridge, Addenbrooke’s Hospital, Cambridge, United Kingdom (V.R.P., T.K.); Department of Cancer Biology, Dana–Farber Cancer Institute, Boston, MA (E.T.C.); Department of Cell Biology, Harvard Medical School, Boston, MA (E.T.C.); MRC Mitochondrial Biology Unit, Cambridge, United Kingdom (M.P.M.); and Department of Anesthesiology, University of Rochester Medical Center, Rochester, NY (P.S.B.).