Affiliation: | aWohl Virion Centre and;bMedical Research Council Centre for Medical Molecular Virology, Division of Infection and Immunity, University College London, London WC1E 6BT, United Kingdom;;cLaboratory of Molecular Virology, International Centre for Genetic Engineering and Biotechnology, 34149 Trieste, Italy; and;dSchool of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom |