1. Department of Neurology, University of Michigan , Ann Arbor , MI 48109, USA
2. Neuroscience Graduate Program, University of Michigan , Ann Arbor , MI 48109, USA
3. Department of Genetics, Stanford University School of Medicine , Stanford , CA 84305, USA
4. Department of Chemistry, University of Michigan , Ann Arbor , MI 48109, USA
5. VA Ann Arbor Healthcare System , Ann Arbor , MI 48105, USA
6. Cellular and Molecular Biology Graduate Program, University of Michigan , Ann Arbor , MI 48109, USA
7. Department of Pathology, University of Michigan , Ann Arbor , MI 48109, USA
8. Biophysics Program, University of Michigan , Ann Arbor , MI 48109, USA