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Relative fitness of Csts/Cstr A. baumannii strains. Values represent the means ± SD from three independent experiments performed at 5 and 20 h. Fitness values below 1 denote fitness cost, while those above 1 denote a fitness benefit. Asterisks indicate statistically significant differences between strains (*, P < 0.05; **, P = 0.001; ***, P < 0.001).
