H W Choi1,2, H J Ahn3, M K Shin3, Y S Son1,4, K S Kim5. 1. Department of Genetic Engineering, College of Life Science and Graduate School of Biotechnology, Kyung Hee University, Yong In, Korea. 2. Lutronic R&D Center, Goyang-si, Gyeonggi-do, Korea. 3. Department of Dermatology, College of Medicine, Kyung Hee University, Seoul, Korea. 4. Kyung Hee Institute of Regenerative Medicine, Seoul, Korea. 5. Department of Biomedical Engineering, College of Medicine, Kyung Hee University, Seoul, Korea.