Molecular and Computational Biology, University of Southern California, CA, USA. jimliu@usc.edu|Molecular and Computational Biology, University of Southern California, CA, USA. jimliu@usc.edu|Molecular and Computational Biology, University of Southern California, CA, USA. jimliu@usc.edu|Molecular and Computational Biology, University of Southern California, CA, USA. jimliu@usc.edu|Molecular and Computational Biology, University of Southern California, CA, USA. jimliu@usc.edu