Computer Engineering Dept, Bilkent University, Center for Bioinformatics, Ankara, Turkey. ugur@cs.bilkent.edu.tr|Computer Engineering Dept, Bilkent University, Center for Bioinformatics, Ankara, Turkey. ugur@cs.bilkent.edu.tr|Computer Engineering Dept, Bilkent University, Center for Bioinformatics, Ankara, Turkey. ugur@cs.bilkent.edu.tr|Computer Engineering Dept, Bilkent University, Center for Bioinformatics, Ankara, Turkey. ugur@cs.bilkent.edu.tr