1. Department of Chemistry, University of California, San Diego, La Jolla 92093-0654.
2. San Diego Supercomputer Center, San Diego, CA 92186-9784.
3. Department of Physics, University of California, San Diego, La Jolla 92093-0654.
4. Department of Biology, University of California, San Diego, La Jolla 92093-0654.
5. Department of Medicine, University of California, San Diego, La Jolla 92093-0654.