Centre for Molecular and Biomolecular Informatics, University of Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands. R.Kerkhoven@cmbi.kun.nl|Centre for Molecular and Biomolecular Informatics, University of Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands. R.Kerkhoven@cmbi.kun.nl|Centre for Molecular and Biomolecular Informatics, University of Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands. R.Kerkhoven@cmbi.kun.nl|Centre for Molecular and Biomolecular Informatics, University of Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands. R.Kerkhoven@cmbi.kun.nl|Centre for Molecular and Biomolecular Informatics, University of Nijmegen, P.O. Box 9010, 6500 GL Nijmegen, The Netherlands. R.Kerkhoven@cmbi.kun.nl