1. Hagey Laboratory for Pediatric Regenerative Medicine and Department of Surgery, Stanford University, Palo Alto, CA 94305, USA.
2. Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Palo Alto, CA 94305, USA.
3. Department of Bioengineering, Stanford University, Palo Alto, CA 94305, USA.
4. Department of Biomaterials and Advanced Drug Delivery, Stanford University, Palo Alto, CA 94305, USA.
5. Department of Genetics, Stanford University, Palo Alto, CA 94305, USA.
6. Department of Biochemistry, Stanford University, Palo Alto, CA 94305, USA.
7. Howard Hughes Medical Institute, Stanford, CA 94305, USA.
8. Department of Orthopaedic Surgery, Stanford University, Palo Alto, CA 94305, USA.
9. Departments of Pathology and Developmental Biology, Stanford University, Palo Alto, CA 94305, USA.