1. Molecular Diagnostic Department, Analytical Medical Laboratory, Agilent Labs, Agilent Technologies, Palo Alto, CA 94304
2. Department of EECS, University of California, Berkeley and International Computer Science Institute, Berkeley, California
3. Institute for Systems Biology, 1441 North 34th Street, Seattle, WA 98103-8904
4. School of Computer Science, Tel-Aviv University, Tel-Aviv 69978, Israel