1. Aging Research Institute, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Republic of Korea
2. Radioisotope Research Division, Department of Research Reactor Utilization, Korea Atomic Energy Research Institute, Daejeon 305-353, Republic of Korea
3. Department of Functional Genomics, University of Science and Technology (UST), Daejeon 305-333, Republic of Korea