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EMSA of DzrR binding to the promoter fragment of desAB. Free probes, i.e., biotin-labeled DNA fragment of P desAB (222 bp) and biotin-labeled control DNA (60 bp), and P desAB probe with DzrR (Bound probe) are indicated by arrows. In A, a concentration of 4 pmol unlabeled DNA fragment of P desAB was added as a competitor for determining the specific binding of DzrR. In A, biotin-labeled DNA probes and biotin-labeled control DNA from EMSA kit were added at a final concentration of 20 fmol.

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