[1] Univ London Imperial Coll Sci Technol & Med, Ctr Mol Microbiol & Infect, Dept Infect Dis, London SW7 2AZ, England
[2] Lincolns Inn Fields Labs, Cell Motil Grp, Canc Res UK, London, England
[3] Mayo Clin, Dept Biochem & Mol Biol, Rochester, MN 55905 USA