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Growth analysis of C. diphtheriae strains in HIBTW medium containing various EDDA concentrations. C. diphtheriae strains C7 and 1737 and their isogenic cdtP mutants were grown for 18 to 20 h in HIBTW medium that contained the iron chelator EDDA at the concentrations indicated. Culture densities were measured at an absorbance of 600 nm. The values shown are the means of three independent experiments, and the results for each data point varied from the mean by less than 10%.
