[1] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Natl Biomed Computat Resource, La Jolla, CA 92093 USA
[3] Univ Calif San Diego, NSF Ctr Theoret Biol Phys, La Jolla, CA 92093 USA
[4] Univ Calif San Diego, Howard Hughes Med Inst, La Jolla, CA 92093 USA
[5] Univ Calif San Diego, Dept Pharmacol, La Jolla, CA 92093 USA