1. Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan.
2. Institute for Memory Impairments and Neurological Disorders (iMIND), University of California, Irvine, California.
3. Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, California.
4. Department of Anatomy and Neurobiology and University of California, Irvine, California.
5. Department of Physical Medicine and Rehabilitation, University of California, Irvine, California.
6. Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan.