Department of Bioengineering, University of California at Los Angeles, Los Angeles, California, United States of America.|Department of Biochemistry, School of Medicine, West Virginia University, Morgantown, West Virginia, United States of America.|Molecular Biology Interdepartmental Graduate Program, University of California at Los Angeles, Los Angeles, California, United States of America , Medical Scientist Training Program, University of California at Los Angeles, Los Angeles, California, United States of America.|Department of Cellular and Molecular Medicine, University of California at San Diego, La Jolla, California, United States of America.|Department of Cellular and Molecular Medicine, University of California at San Diego, La Jolla, California, United States of America.|Department of Bioengineering, University of California at Los Angeles, Los Angeles, California, United States of America , Department of Microbiology, Immunology and Molecular Genetics, University of California at Los Angeles, Los Angeles, California, United States of America , Howard Hughes Medical Institute, University of California at Los Angeles, Los Angeles, California, United States of America.