Cologne University Bioinformatics Center, Cologne University, Cologne, Germany. egonw@users.sf.net|Cologne University Bioinformatics Center, Cologne University, Cologne, Germany. egonw@users.sf.net|Cologne University Bioinformatics Center, Cologne University, Cologne, Germany. egonw@users.sf.net|Cologne University Bioinformatics Center, Cologne University, Cologne, Germany. egonw@users.sf.net|Cologne University Bioinformatics Center, Cologne University, Cologne, Germany. egonw@users.sf.net|Cologne University Bioinformatics Center, Cologne University, Cologne, Germany. egonw@users.sf.net|Cologne University Bioinformatics Center, Cologne University, Cologne, Germany. egonw@users.sf.net