1. Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94158, USA.
2. Howard Hughes Medical Institute, University of California, San Francisco, CA 94158, USA.
3. California Institute for Quantitative Biomedical Research, University of California, San Francisco, CA 94158, USA.
4. Department of Urology, University of California, San Francisco, CA 94158, USA.
5. Helen Diller Family Comprehensive Cancer Center, San Francisco, CA 94158, USA.