1Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Republic of Korea,
2Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul 151-742, Republic of Korea,
3College of Agriculture, Life and Environment Sciences, Chungbuk National University, Cheongju 361-763, Republic of Korea,
4College of Natural Resources and Life Science, Dong-A University, Pusan 604-714, Republic of Korea
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Corresponding author:
Yeon Ho Je , Tel: 82-2-880-4696,