Institute of Computer Science and Department of Genetics, Institute of Biology, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany.|Institute of Computer Science and Department of Genetics, Institute of Biology, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany.|Institute of Computer Science and Department of Genetics, Institute of Biology, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany.