Figure 2. Expression Arrays Reveal Changes in Nitrogen Transporters.

(A) Ranked list of expression data from steady-state chemostats with different potassium concentrations (the same chemostats shown in Figure 1). The arrays use 13 mM potassium (far left) as a reference and are ranked from most induced in 1.3 mM potassium to most repressed in 1.3 mM potassium. Each row represents a single gene and each column is a single array. Red values indicate a higher expression compared to the reference, whereas green values indicate a lower expression. The intensity of the color represents the strength of the fold change and corresponds to the legend in the bottom right.

(B) Genes that were 3-fold induced (top) or 3-fold repressed (bottom) in 1.3 mM potassium are shown with their gene name.