Computational Materials Science Center, George Mason University, Fairfax, Virginia, United States of America.|Section of Neurobiology, Department of Biological Sciences, University of South California, Los Angeles, California, United States of America.|Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia, United States of America.|Center for Computational Material Science, Code 6390, Naval Research Laboratory, Washington, DC, United States of America.|Section of Neurobiology, Department of Biological Sciences, University of South California, Los Angeles, California, United States of America.