About the Authors
Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts, United States of America
Department of Neurobiology, Harvard Medical School, Boston, Massachusetts, United States of America
Zilkha Neurogenetic Institute, University of Southern California, Los Angeles, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: YH ZH DS JMK. Performed the experiments: YH ZH DS. Analyzed the data: YH ZH. Wrote the paper: YH JMK.