Biologically active oligodeoxyribonucleotides-VI1 : Structure-activity relationships of anti-HIV-1 hexadeoxyribonucleotides bearing 3′- and 5′-End-modifications: R. Kogaa, M. Koizumia, H. Hotodaa, K. Momotab, T. Ohmineb, H. Furukawab, T. Nishigakib, T. Kosakac, M. Kanekoa, S. Kimurad, and K. Shimadad a) Exploratory Chemistry Res. Lab., b) Biological Res. Lab., and c) Analytical and Metabolic Res. Lab., Sankyo Co. Ltd., Tokyo, Japan; d) Dept. of Infectious Diseases, the Inst. of Medical Science, the Univ. of Tokyo, Japan