1. School
of Computer Science and Engineering, Seoul National University, Seoul 08826, Korea
2. California
NanoSystems Institute, University of California, Los Angeles, Los Angeles, California 90095, United States
3. Department
of Chemistry and Biochemistry, University of California, Los Angeles, Los
Angeles, California 90095, United States
4. Department
of Psychiatry and Biobehavioral Sciences, Semel Institute for Neuroscience
and Human Behavior, and Hatos Center for Neuropharmacology, University of California, Los Angeles, Los Angeles, California 90095, United States