Terry Fox Laboratory, British Columbia Cancer Agency, Vancouver, BC V5Z 1L3, Canada, Bioinformatics Graduate Program, University of British Columbia, Vancouver, BC V6T 1Z3, Canada, Max-Planck-Institut fur Informatik, Saarland University, 66123, Saarbrucken, Germany, Departments of Computer Science and Departments of Medical Genetics, University of British Columbia, Vancouver, BC V6T 1Z3, Canada.