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Composition of the polyglutamate capsule in B. anthracis Ames glutamate racemase mutants. Purified capsule polymers from B. anthracis Ames and its racE1Ames or racE2Ames mutants were hydrolyzed in hydrochloric acid, labeled with 1% FDAA, and separated by rpHPLC. l-Glutamic acid, d-glutamic acid, and poly-l-glutamic acid were used as controls.
