1. Polar BioCenter, Korea Polar Research Institute, KORDI, Incheon 406-840, South Korea
2. Division of Life Bioscience and Biotechnology, IBST, Konkuk University, Seoul 143-713, South Korea
3. Department of Biology, Yonsei University, Seoul 120-749, South Korea
4. Biotechnology Center for Agriculture and the Environment, Cook College, Rutgers University, Rutgers, New Jersey 08901-8520