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Growth characterization of the F. tularensis subsp. novicida ΔISftu2 mutant. F. tularensis subsp. novicida strain U112 (wild type; solid line) and the ΔISftu2 mutant (dashed line) were cultured in TSB supplemented with 0.1% cysteine and incubated at 37°C (A) and 25°C (B), the temperatures of the mouse host and tick host, respectively. Error bars represent the mean ± one standard deviation.
