1. School of Life Sciences and Biotechnology; Korea University; Seoul 136-713 Korea
2. College of Pharmacy and Research Institute of Pharmaceutical Sciences; Seoul National University; Daehak-dong, Gwanank-gu Seoul 151-742 Korea
3. Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science; Seoul National University; Daehak-dong, Gwanank-gu Seoul 151-742 Korea
4. Kolon Life Science; Seoul 153-786 Korea
5. Department of Animal Biotechnology, College of Animal Bioscience & Technology; Konkuk University; Seoul 143-701 Korea