Department of Computer Science and Inter-Departmental Program in Bioinformatics, University of California, Los Angeles, CA 90095, USA.|Department of Computer Science and Inter-Departmental Program in Bioinformatics, University of California, Los Angeles, CA 90095, USA.|Department of Computer Science and Inter-Departmental Program in Bioinformatics, University of California, Los Angeles, CA 90095, USA.|Department of Computer Science and Inter-Departmental Program in Bioinformatics, University of California, Los Angeles, CA 90095, USA.|Department of Computer Science and Inter-Departmental Program in Bioinformatics, University of California, Los Angeles, CA 90095, USA.|Department of Computer Science and Inter-Departmental Program in Bioinformatics, University of California, Los Angeles, CA 90095, USA.