Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.|Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.|Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.|Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.|Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.|Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA.