Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Tel-Aviv University, Tel Aviv, Israel.|Center for Bioinformatics, Quantitative Biology Center, and Department of Computer Science, Tübingen University, Tübingen, Germany, Department of Systems Biology, Harvard University, Boston, Massachusetts, United States of America.|Department of Systems Biology, Harvard University, Boston, Massachusetts, United States of America.|Polymer Research Centre and Chemical Engineering Department, Bogazici University, Bebek-Istanbul, Turkey.|Department of Biochemistry and Molecular Biology, George S. Wise Faculty of Life Sciences, Tel-Aviv University, Tel Aviv, Israel.