[1] Burnham Inst Med Res, La Jolla, CA 92037 USA
[2] Univ Florence, Magnet Resonance Ctr, I-50019 Sesto Fiorentino, Italy
[3] New York Struct Biol Ctr, New York, NY 10027 USA
[4] CNIO, Expt Therapeut Programme, Madrid 28029, Spain
[5] Univ Barcelona, Dept Organ Chem, E-08028 Barcelona, Spain
[6] Univ Barcelona, Biomed Res Inst, E-08028 Barcelona, Spain
[7] Novartis Inst BioMed Res, CH-4002 Basel, Switzerland
[8] Univ Calif San Francisco, Sch Pharm, San Francisco, CA 94158 USA
[9] Univ Leeds, Inst Mol & Cellular Biol, Leeds LS2 9JT, W Yorkshire, England
[10] Tech Univ Munich, Ctr Integrated Prot Sci, D-85747 Munich, Germany
[11] Univ Hamburg, Inst Organ Chem, D-20146 Hamburg, Germany
[12] Forsch Inst Mol Pharmakol, D-13125 Berlin, Germany
[13] Univ Notre Dame, Notre Dame, IN 46556 USA
[14] Ctr Biomol Magnet Resonance, D-60438 Frankfurt, Germany
[15] Leiden Univ, Inst Chem, NL-2300 RA Leiden, Netherlands