FIG. 7.

Uptake of ⁵⁵FeCl₃ by Y. pestis strains KIM6 (Ybt⁻ Yfe⁺ Yfu⁺), KIM6-2082 (Ybt⁻ Yfe⁺ Yfu⁻), KIM6-2031.1 (Ybt⁻ Yfe⁻ Yfu⁺), and KIM6-2082.1 (Ybt⁻ Yfe⁻ Yfu⁻). Where indicated (closed symbols), cells were metabolically poisoned by addition of 100 μM CCCP 10 min prior to addition of isotope. These data are from a single assay but are representative of three independent experiments.