Department of Computer Science, Ben-Gurion University of the Negev, Beer-Sheva, Israel.|Institute of General Microbiology, Christian-Albrechts University Kiel, Kiel, Germany.|Bioinformatics Core Facility, National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, Israel.|Department of Computer Science, Ben-Gurion University of the Negev, Beer-Sheva, Israel.