FIG. 4.

Determination of the transcription start site(s) of bdhA by primer extension analysis. The products of the sequencing reactions, using the same primer, are shown on the left of the extension product (P). The sequence surrounding the extension products is shown on the left of the ladder. The putative ς⁵⁴ binding consensus sequence is underlined. The positions of the observed extension products are marked by arrows labeled S1 and S2 and the corresponding nucleotides are boldfaced and capitalized in the adjoining sequence ladder.