1 Fukushima Prefectural General Hygiene Institute, Fukushima, Japan; Department of Microbiology and Immunochemistry, Asahikawa Medical University, Asahikawa, Japan; Department of Molecular Biology and Biochemistry, Ayala School of Biological Sciences, University of California, Irvine, CA, USA. Electronic address: tfujita@jupiter.sannet.ne.jp.
2 Fukushima Prefectural General Hygiene Institute, Fukushima, Japan; Department of Microbiology and Immunochemistry, Asahikawa Medical University, Asahikawa, Japan; Department of Molecular Biology and Biochemistry, Ayala School of Biological Sciences, University of California, Irvine, CA, USA. Electronic address: wakamiya@asahikawa-med.ac.jp.
3 Fukushima Prefectural General Hygiene Institute, Fukushima, Japan; Department of Microbiology and Immunochemistry, Asahikawa Medical University, Asahikawa, Japan; Department of Molecular Biology and Biochemistry, Ayala School of Biological Sciences, University of California, Irvine, CA, USA. Electronic address: atenner@uci.edu.