Images of the anthrax toxin protective antigen heptamer. Images
are either from the top or side, coloured to show various structural
relationships of the seven protein units. In each image is also
a gold molecule (our target drug) binding to the protein and thereby
blocking the binding of the lethal factor to the heptamer. We would
like to thank Carlo Petosa (EMBL Grenoble Outstation, France) for
kindly giving us the structure of the PA heptamer.