Delft Bioinformatics Lab, Department of Intelligent Systems, Faculty of Electrical Engineering, Mathematics & Computer Science, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands. Tel.: +31 15 2785114, Fax: +31 15 2787022, d.deridder@tudelft.nl.|Delft Bioinformatics Lab, Department of Intelligent Systems, Faculty of Electrical Engineering, Mathematics & Computer Science, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands. Tel.: +31 15 2785114, Fax: +31 15 2787022, d.deridder@tudelft.nl.|Delft Bioinformatics Lab, Department of Intelligent Systems, Faculty of Electrical Engineering, Mathematics & Computer Science, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands. Tel.: +31 15 2785114, Fax: +31 15 2787022, d.deridder@tudelft.nl.