European Bioinformatics Institute, Hinxton, UK. trieschn@ewi.utwente.nl|European Bioinformatics Institute, Hinxton, UK. trieschn@ewi.utwente.nl|European Bioinformatics Institute, Hinxton, UK. trieschn@ewi.utwente.nl|European Bioinformatics Institute, Hinxton, UK. trieschn@ewi.utwente.nl|European Bioinformatics Institute, Hinxton, UK. trieschn@ewi.utwente.nl|European Bioinformatics Institute, Hinxton, UK. trieschn@ewi.utwente.nl