Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA. fsun@usc.edu or msw@usc.edu.|Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA. fsun@usc.edu or msw@usc.edu.|Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA. fsun@usc.edu or msw@usc.edu.|Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA. fsun@usc.edu or msw@usc.edu.|Molecular and Computational Biology Program, University of Southern California, 1050 Childs Way, Los Angeles, CA 90089, USA. fsun@usc.edu or msw@usc.edu.