1. Genomics Institute of the Novartis Research Foundation, 10675 John Jay Hopkins Drive, San Diego, California 92121, United States
2. Department
of Mathematics and Center for Theoretical Biological Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0112, United States
3. Department
of Mathematics, University of California, San Diego, 9500 Gilman
Drive, La Jolla, California 92093-0112, United States
4. Department
of Chemistry and Biochemistry, Department of Pharmacology, Howard
Hughes Medical Institute, and Center for Theoretical Biological Physics, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0365, United States