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Representation of PhoP-regulated promoters. Three classes of PhoP-dependent promoter were shown. Y. pestis PhoP binds to DNA regions at various positions from the RNA polymerase-binding site (-10 and -35 elements), i.e., upstream (a), overlapping (b) or downstream (c) of the promoter -35 elements. The corresponding experimental promoters could be found in Figure 2.
