FIG. 4.
Nucleotide sequences of promoter regions of the levanase operon (plev), the rocABC operon (procABC), the rocDEF operon (procDEF), and the bkd operon (pbkd). The transcriptional start sites are indicated by arrows. Boxes indicate strictly conserved DNA sequences around positions −12 and −24 with respect to the transcriptional start sites.