1. Cardiovascular Research Institute, University of California, San Francisco, California 94158, United States
2. Department of Anesthesia and Perioperative Care, University of California, San Francisco, California 94143, United States
3. Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94143, United States
4. D. E. Shaw Research, New York, New York 10036, United States
5. Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, United States