1. Institute of Molecular Biology and Genetics, Seoul National University, 599 Kwanak-ro, Kwanak-gu, Seoul 151-742, Republic of Korea
2. Division of Biology and Ocean Sciences, Inha University, Incheon 402-751, Republic of Korea
3. School of Biological Sciences & Institute of Bioinformatics (BIOMAX), Seoul National University, 599 Kwanak-ro, Kwanak-gu, Seoul 151-742, Republic of Korea