1 Department of Microbiology, Chungbuk National University 1 Chungdae-Ro, Seowon-Gu Cheongju 28644 South Korea jyahn@chungbuk.ac.kr kyh@chungbuk.ac.kr +82-43-264-9600 +82-43-261-2301.
2 Department of Bioengineering, University of Pennsylvania 210 S 33rd St Philadelphia PA 19104 USA.