1. Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul 03080, Korea
2. Department of Physiology, Seoul National University College of Medicine, Seoul 03080, Korea
3. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
4. Interdisciplinary Program in Bioengineering, College of Engineering, Seoul National University, 1 Gwanak-ro, Seoul 151-742, Korea
5. Neuroscience Research Institute, Seoul National University College of Medicine, Seoul 03080, Korea