FIG. 1.

Relative transcript abundance measured by qPCR. (A) Restoration of the appA transcript in the prrA null mutant, PRRBCA2, grown under low-oxygen conditions. The expression of appA in PRRBCA2 is assigned to 1 arbitrary unit. (B) Effect of appA level on transcript abundance of PS genes measured in cultures grown under low-oxygen conditions. Expression values are averages from three to four independent experiments, for each of which qPCR was done in triplicate. Error bars represent standard deviations.