1. Department of Biochemistry, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.
2. MRC for Cell Death Disease Research Center, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.
3. Molecular Neurobiology Laboratory, McLean Hospital, Harvard Medical School, 115 Mill Street, Belmont, MA 02478, USA.
4. Department of Psychiatry, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.