1. Independent, San Diego, CA 92102, USA.
2. Structural Genomics Consortium, University of Oxford, Oxford OX3 7DQ, UK.
3. Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada.
4. University of California, San Francisco, San Francisco, CA 94143, USA.
5. Sage Bionetworks, Seattle, WA 98109, USA.