1. From the Department of Pediatrics (A.L., E.S., E.C.M., M.R.), Stanford University School of Medicine, Calif; the Department of Molecular Cancer Biology (N.A., E.L.), Danish Cancer Society, Copenhagen, Denmark; Division of Neuroscience (W.J.S., A.J.H.), University of Edinburgh, United Kingdom; the Institute of Biomedical and Life Sciences (M.R.M.), University of Glasgow, United Kingdom; and the Department of Physiology (A.-M.S.), Columbia University, New York. The present address for A.L. is the...