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Citrate uptake by B. pertussis strains. BPSM carrying an intact copy of the operon (black circles) and two isogenic mutants, one with an in-frame deletion of the bug4 gene (black squares) and the other carrying a knockout mutation of the B. pertussis tctA ortholog (open triangles), were used to monitor the uptake of radiolabeled citrate over time. The results are expressed as picomoles of radioactive citrate incorporated by 109 cells.
