FIG. 4.

Analysis of the promoter P₁₂₀₇ with different potential regulators by the CAT assay. For an explanation of the genomic region at the top of the figure, see the legend to Fig. 3. (A) Promoter activity was assayed with long genomic fragments containing several ORFs possibly coding for regulators. (B) The 230-bp promoter region (presented by an arrowhead) was cloned into the CAT reporter vector and the potential regulator genes (colored gray) in another, compatible vector. The plasmid constructs are indicated at the left. For the level of the CAT expression (plus and minus signs), see Fig. 3 legend.