1. Lab of Stem Cells and Cell Reprogramming, Department of Biomedical Engineering, Dongguk University, Seoul 100-715, Korea
2. Department of Electrical and Electronic Engineering, Hankyong National University, Kyonggi-do 456-749, Korea
3. Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
4. Dongguk University Research Institute of Biotechnology, Dongguk University, Seoul 100-715, Korea