FIG. 6.

Northern blot analysis of nblB expression. RNA was isolated from both the wild type (lanes 1 to 3) and the nblBΩ mutant (lanes 4 to 6) after nutrient-replete growth (lanes 1 and 4) or growth under sulfur-deficient (lanes 2 and 5) and nitrogen-deficient (lanes 3 and 6) conditions. The RNA was hybridized to a nblB gene-specific probe described in Materials and Methods. The rRNA loading controls are shown at the bottom.