[1] Univ London Imperial Coll Sci Technol & Med, Fac Med, Glycosci Lab, Harrow, Middx, England
[2] MRC Natl Inst Med Res, Div Virol, London, England
[3] Philipps Univ, Inst Virol, Marburg, Germany
[4] Gifu Univ, Dept Appl Bioorgan Chem, Fac Appl Biol Sci, Gifu 50111, Japan