Bioinformatics Division, Center for Synthetic and Systems Biology, TNLIST, Department of Automation, Tsinghua University, Beijing, China.|Program in Computational Biology and Bioinformatics, University of Southern California, Los Angeles, CA, USA.|Bioinformatics Division, Center for Synthetic and Systems Biology, TNLIST, Department of Automation, Tsinghua University, Beijing, China.|Bioinformatics Division, Center for Synthetic and Systems Biology, TNLIST, Department of Automation, Tsinghua University, Beijing, China.