1. Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA 90095, USA.
2. Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA 90095, USA.
3. QB3-Berkeley, University of California, Berkeley, Berkeley, CA 94720, USA.
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, CA 90095, USA.
5. Departments of Molecular and Cell Biology and Plant and Microbial Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
6. Environmental Genomics and Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.