1. Cancer Cell and Molecular Biology Branch, Research Institute, National Cancer Center, Goyang, Gyeonggi-do 410-769, Republic of Korea
2. Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul 138-736, Republic of Korea
3. Center for Theragnosis, Biomedical Research Institute, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
4. Department of Biological Chemistry, University of Science and Technology, Daejeon 305-333, Republic of Korea