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Iron-deficient growth of Y. pestis strains. All strains were grown in deferrated PMH2 at 37°C. Where indicated, purified Ybt was added to KIM6+ (Ybt+) and KIM6-2180 (Δirp2-2046.3 Δpsn2045.1) at a concentration similar to that produced by a Ybt+ strain. The growth curves shown are from one of two independent experiments, which yielded similar results.
