1. Institute for Stem Cell Biology and Regenerative Medicine, and Department of Pathology, Stanford University, Stanford, CA 94305, USA.
2. Department of Obstetrics and Gynecology, Stanford University, Stanford, CA 94305, USA.
3. Program in Epithelial Biology, Department of Dermatology, Stanford University, Stanford, CA 94305, USA.
4. Department of Developmental Biology, Stanford University, Stanford, CA 94305, USA.
5. Institute for Regenerative Cures, School of Medicine, University of California, Davis, Sacramento, CA 95817, USA.
6. Departments of Pediatrics and Genetics, Stanford University, Stanford, CA 94305, USA.