Molecular and Computational Biology, University of Southern California, MCB201, 1050 Childs way, Los Angeles, CA 90089-2910, USA. ruijiang@usc.edu|Molecular and Computational Biology, University of Southern California, MCB201, 1050 Childs way, Los Angeles, CA 90089-2910, USA. ruijiang@usc.edu|Molecular and Computational Biology, University of Southern California, MCB201, 1050 Childs way, Los Angeles, CA 90089-2910, USA. ruijiang@usc.edu|Molecular and Computational Biology, University of Southern California, MCB201, 1050 Childs way, Los Angeles, CA 90089-2910, USA. ruijiang@usc.edu