1. University of Science and Technology (UST), 113 Gwahangno, Yuseong, Daejeon 305-350, Republic of Korea
2. Korea Research Institute of Bioscience and Biotechnology (KRIBB), PO Box 115, Yuseong, Daejeon 306-809, Republic of Korea
3. Department of Food Science and Biotechnology, Sungkyunkwan University, Jangan-gu, Suwon, Gyeonggi-do 440-746, Republic of Korea