1. Graduate School of East-West Medical Science, Kyung Hee University, Suwon 449-701, Korea; Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejon 305-333, Korea; RealBioTech Company Ltd., #202, BVC, KRIBB, Daejon 305-333, Korea; Department of Biological Science, Chonbuk National University, Jeonju 561-756, Korea; and Division of Biotechnology, The Catholic University of Korea, Kyonggi-Do 420-743, Korea