Department of Bioinformatics, Friedrich-Schiller-University Jena 07743 Jena, Germany. kamp@minet.uni-jena.de|Department of Bioinformatics, Friedrich-Schiller-University Jena 07743 Jena, Germany. kamp@minet.uni-jena.de|Department of Bioinformatics, Friedrich-Schiller-University Jena 07743 Jena, Germany. kamp@minet.uni-jena.de