Genes differentially regulated between <i>B. pertussis</i> strain B1920 (<i>ptxP1</i>) and B1917 (<i>ptxP3</i>) upon sulfate-modulation.

<p>Sulfate was used to induce high (50 mM), medium (5 mM), and low (<0.02 mM, represented as 0 mM) sulfate conditions in a <i>ptxP3</i> and <i>ptxP1</i> strain. A) The number of genes expressed at least 3-fold higher between strains are indicated for each sulfate concentration. B&C) The pie charts subdivide the 44 genes expressed higher in the <i>ptxP1</i> strain as compared to the <i>ptxP3</i> strain under high sulfate conditions (B) and the 61 genes expressed higher in the <i>ptxP3</i> strain as compared to the <i>ptxP1</i> strain under medium sulfate conditions (C) into functional gene categories. The number of genes belonging to each category is numbered between brackets.