Molecular and Computational Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, CA 900089, USA. jianjunh@usc.edu|Molecular and Computational Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, CA 900089, USA. jianjunh@usc.edu|Molecular and Computational Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, CA 900089, USA. jianjunh@usc.edu|Molecular and Computational Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, CA 900089, USA. jianjunh@usc.edu