1. Graduate School of Biotechnology, Korea University, 1, 5-ka, Anam-dong, Sungbuk-ku, Seoul 136-701, Korea, Program for Bio-Microsystem Technology, Korea University, 1, 5-ka, Anam-dong, Sungbuk-ku, Seoul 136-701, Korea, BioDigit Laboratories Corp., Korea University, Biotechnology Building, Technology Incubation Center, 1, 5-ka, Anam-dong, Sungbuk-ku, Seoul 136-701, Korea, and Department of Biotechnology, Korea University, Jochiwon, Choongnam 339-800, Korea