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A simple version: the anthrax bacterium makes a particular protein complex - the anthrax toxin - that disrupts cell membranes. This toxin has seven-fold symmetry, meaning that it is made up of seven identical subunits. There are various peptides that bind to each subunit and inhibit the anthrax toxin, thereby protecting cells.
What this group has done is to make liposomes (fat globules, not antibodies) with different concentrations of these peptides on the surface. When the density of inhibitory peptides on the liposomes roughly matches the density of target sites (one on each of the seven subunits) on the anthrax toxin, the inhibition is much more efficient. (This means you need much less of the peptide to protect cells.)
This general idea - of putting lots of inhibitory agents on one particle or compound - has been done before. The big advance here is that this is an easy way control the number & density of the inhibitors. Pretty slick.