1. School of Biological Science, Seoul National University and National Creative Research Initiative Center for Symbiosystem, Seoul 151-742, South Korea.
2. Research Center for Human Natural Defense System, Yonsei University College of Medicine, CPO Box 8044 Seoul, South Korea.
3. Department of Bioinspired Science and Division of Life and Pharmaceutical Science, Ewha Woman’s University, Seoul 120-750, South Korea.