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Cell shape abnormalities of germinated racE2 mutants. Spores (1 × 106/ml) derived from wild-type and ΔracE2::aad9 mutant B. anthracis Sterne were inoculated into BHI broth. Aliquots were withdrawn at timed intervals, fixed with formalin, and analyzed by phase-contrast microscopy. Scale bar, 5 μm. Arrows identify round and oval cells.
