1. Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037
2. La Trobe Institute for Molecular Science, Melbourne, VIC 3086, Australia
3. Department of Molecular Medicine, The Scripps Research Institute, La Jolla, CA 92037
4. Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037
5. Cancer Center, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724