| http://www.w3.org/ns/prov#value | - Additionally, they may be used as component(s) of a multivalent vaccine for B. anthracis and/or other pathogens. [0039] Definitions [0040] As used herein, unless otherwise specifically noted, ???PA??? refers to all forms of PA which are useful in the compositions and/or methods of the invention, including unmodified native or recombinant B. anthracis protective antigen (PA), or a modified form (va
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