- Eun Ju Yun: Department of Biotechnology, Korea University Graduate School, Seoul 136-713, Republic of Korea.
- In-Geol Choi: Department of Biotechnology, Korea University Graduate School, Seoul 136-713, Republic of Korea.
- Kyoung Heon Kim: Department of Biotechnology, Korea University Graduate School, Seoul 136-713, Republic of Korea. Electronic address: khekim@korea.ac.kr.