Bioinformatics Group, Centre for Infectious Disease, Institute of Cell and Molecular Science, Queen Marys School of Medicine and Dentistry, University of London, 32 Newark St, London E1 2AA, UK. j.a.casbon@qmul.ac.uk <j.a.casbon@qmul.ac.uk>|Bioinformatics Group, Centre for Infectious Disease, Institute of Cell and Molecular Science, Queen Marys School of Medicine and Dentistry, University of London, 32 Newark St, London E1 2AA, UK. j.a.casbon@qmul.ac.uk <j.a.casbon@qmul.ac.uk>