1. Molecular Graphics and Computation Facility, College of Chemistry, University of California, Berkeley, California 94720, United States
2. Department of Environmental Toxicology, University of California, Davis, California 95616, United States
3. Department of Neurobiology, Physiology and Behavior, University of California, Davis California 95616, United States
4. Department of Nutritional Sciences and Toxicology, University of California, Berkeley, California 94720, United States
5. Division of Environmental Health Sciences, School of Public Health, University of California Berkeley, Berkeley, California 94720, United States