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The anthrax toxin is an AB-type bacterium toxin composed of the protective antigen (PA) as the cell-binding B component, and the lethal factor (LF) and edema toxin (EF) as the catalytic A components. The PA component is a key factor in anthrax-related research and recombinant PA can be produced in general in Escherichia coli. However, such recombinant PA always forms inclusion bodies in the cytoplasm...
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