1. Department of Biological Chemistry, University of California, Los Angeles, Los Angeles, United States
2. Molecular Biology Institute, University of California, Los Angeles, Los Angeles, United States
3. Department of Pathology and Laboratory Medicine, University of California, Los Angeles, Los Angeles, United States
4. Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, United States