Department of Life Science, Gwangju Institute of Science and Technology 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.|Department of Life Science, Gwangju Institute of Science and Technology 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.|Department of Life Science, Gwangju Institute of Science and Technology 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.|Department of Life Science, Gwangju Institute of Science and Technology 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea.