Yilin Meng1, Lalima G Ahuja2, Alexandr P Kornev2, Susan S Taylor3, Benoît Roux4. 1. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA. 2. Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093, USA. 3. Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093, USA; Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA 92093, USA. 4. Department of Biochemistry and Molecular Biology, University of Chicago, Chicago, IL 60637, USA. Electronic address: roux@uchicago.edu.