Affiliation: | (1) Genome Research Group, National Institute of Radiological Sciences, Anagawa 4-9-1, Inage-ku, Chiba 263-8555, Japan Tel. 181-43-206-3135 Fax 181-43-251-9818 e-mail: t_saito@nirs.go.jp, JP;(2) Helix Research Institute, Kisarazu, Chiba, Japan/, JP;(3) Department of Virology, the Institute of Medical Sciences, University of Tokyo, Tokyo, Japan, JP;(4) Department of Biological Cybernetics, Medical Research Institute, Tokyo Medical Dental University, Tokyo, Japan, JP |