1 The Scripps Research Institute, La Jolla, CA, USA.
2 Cell Biology and Biophysics Unit, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, Bethesda, MD, USA.
3 The Scripps Research Institute, La Jolla, CA, USA. glander@scripps.edu.
4 Cell Biology and Biophysics Unit, Porter Neuroscience Research Center, National Institute of Neurological Disorders and Stroke, Bethesda, MD, USA. antonina@mail.nih.gov.
5 Biochemistry and Biophysics Center, National Heart, Lung and Blood Institute, Bethesda, MD, USA. antonina@mail.nih.gov.