1. Department of Neurological Surgery, University of California, San Francisco, San Francisco, CA 94143, USA.
2. Department of Pediatrics, University of California, San Francisco, San Francisco, CA 94143, USA.
3. Department of Neurology, University of California, San Francisco, San Francisco, CA 94143, USA.
4. Department of Radiology, University of California, San Francisco, San Francisco, CA 94143, USA.
5. Bioengineering Graduate Group, University of California, San Francisco, San Francisco, CA 94143, USA.
6. Division of Transplantation, Department of Surgery, University of California, San Francisco, San Francisco, CA 94143, USA.
7. Fetal Treatment Center, University of California, San Francisco, San Francisco, CA 94143, USA.
8. Clinical & Translational Science Institute, University of California, San Francisco, San Francisco, CA 94143, USA.
9. StemCells Inc., Newark, CA 94560, USA.
10. Howard Hughes Medical Institute.