1. Department of Bioengineering, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305;
2. Department of Bioengineering, Neuroscience Program, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305;
3. Departments of Psychiatry and Behavioral Sciences, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305;
4. Departments of Psychiatry, Howard Hughes Medical Institute, Stanford University, Stanford, California 94305;