1. Department of Anatomy, University of California, San Francisco, CA, USA.
2. Biomedical Sciences Graduate Program, University of California, San Francisco, CA, USA.
3. Department of Neurology, University of California, San Francisco, CA, USA.
4. Memory and Aging Center, University of California, San Francisco, CA, USA.
5. Sandler-Moore Mass Spectrometry Core Facility, University of California, San Francisco, CA, USA.
6. Department of Physical Therapy and Rehabilitation Science, San Francisco, CA, USA.
7. Eli and Edythe Broad Center for Regeneration Medicine and Stem Cell Research, San Francisco, CA, USA.